diff --git a/dataforge-vis-common/src/commonMain/kotlin/hep/dataforge/properties/ConfigProperty.kt b/dataforge-vis-common/src/commonMain/kotlin/hep/dataforge/properties/ConfigProperty.kt
new file mode 100644
index 00000000..113d77ba
--- /dev/null
+++ b/dataforge-vis-common/src/commonMain/kotlin/hep/dataforge/properties/ConfigProperty.kt
@@ -0,0 +1,24 @@
+package hep.dataforge.properties
+
+import hep.dataforge.meta.Config
+import hep.dataforge.meta.MetaItem
+import hep.dataforge.meta.get
+import hep.dataforge.names.Name
+
+class ConfigProperty(val config: Config, val name: Name) : Property<MetaItem<*>?> {
+    override var value: MetaItem<*>?
+        get() = config[name]
+        set(value) {
+            config[name] = value
+        }
+
+    override fun onChange(owner: Any?, callback: (MetaItem<*>?) -> Unit) {
+        config.onChange(owner) { name, oldItem, newItem ->
+            if (name == this.name && oldItem != newItem) callback(newItem)
+        }
+    }
+
+    override fun removeChangeListener(owner: Any?) {
+        config.removeListener(owner)
+    }
+}
\ No newline at end of file
diff --git a/dataforge-vis-common/src/commonMain/kotlin/hep/dataforge/properties/Property.kt b/dataforge-vis-common/src/commonMain/kotlin/hep/dataforge/properties/Property.kt
new file mode 100644
index 00000000..fdd37132
--- /dev/null
+++ b/dataforge-vis-common/src/commonMain/kotlin/hep/dataforge/properties/Property.kt
@@ -0,0 +1,57 @@
+package hep.dataforge.properties
+
+import hep.dataforge.meta.DFExperimental
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.channels.awaitClose
+import kotlinx.coroutines.flow.callbackFlow
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.launch
+
+//TODO move to core
+
+interface Property<T> {
+    var value: T
+
+    fun onChange(owner: Any? = null, callback: (T) -> Unit)
+    fun removeChangeListener(owner: Any? = null)
+}
+
+@OptIn(ExperimentalCoroutinesApi::class)
+fun <T> Property<T>.flow() = callbackFlow<T> {
+    send(value)
+    onChange(this) {
+        //TODO add exception handler?
+        launch {
+            send(it)
+        }
+    }
+    awaitClose { removeChangeListener(this) }
+}
+
+/**
+ * Reflect all changes in the [source] property onto this property
+ *
+ * @return a mirroring job
+ */
+fun <T> Property<T>.mirror(source: Property<T>, scope: CoroutineScope): Job {
+    return scope.launch {
+        source.flow().collect {
+            value = it
+        }
+    }
+}
+
+/**
+ * Bi-directional connection between properties
+ */
+@DFExperimental
+fun <T> Property<T>.bind(other: Property<T>) {
+    onChange(other) {
+        other.value = it
+    }
+    other.onChange {
+        this.value = it
+    }
+}
\ No newline at end of file
diff --git a/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/js/bindings.kt b/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/js/bindings.kt
new file mode 100644
index 00000000..48d373d7
--- /dev/null
+++ b/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/js/bindings.kt
@@ -0,0 +1,30 @@
+package hep.dataforge.js
+
+import hep.dataforge.properties.Property
+import org.w3c.dom.HTMLInputElement
+
+fun HTMLInputElement.bindValue(property: Property<String>) {
+    if (this.onchange != null) error("Input element already bound")
+    this.onchange = {
+        property.value = this.value
+        Unit
+    }
+    property.onChange(this) {
+        if (value != it) {
+            value = it
+        }
+    }
+}
+
+fun HTMLInputElement.bindChecked(property: Property<Boolean>) {
+    if (this.onchange != null) error("Input element already bound")
+    this.onchange = {
+        property.value = this.checked
+        Unit
+    }
+    property.onChange(this) {
+        if (checked != it) {
+            checked = it
+        }
+    }
+}
\ No newline at end of file
diff --git a/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/js/bootstrap.kt b/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/js/bootstrap.kt
index eb99704a..9c3b15f7 100644
--- a/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/js/bootstrap.kt
+++ b/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/js/bootstrap.kt
@@ -16,9 +16,11 @@ inline fun TagConsumer<HTMLElement>.card(title: String, crossinline block: TagCo
 }
 
 inline fun RBuilder.card(title: String, crossinline block: RBuilder.() -> Unit) {
-    div("card w-100") {
+    div("card w-100 h-100") {
         div("card-body") {
-            h3(classes = "card-title") { +title }
+            h3(classes = "card-title") {
+                +title
+            }
             block()
         }
     }
@@ -78,7 +80,7 @@ fun RBuilder.accordion(id: String, elements: List<Pair<String, RDOMBuilder<DIV>.
             elements.forEachIndexed { index, (title, builder) ->
                 val headerID = "${id}-${index}-heading"
                 val collapseID = "${id}-${index}-collapse"
-                div("card") {
+                div("card p-0 m-0") {
                     div("card-header") {
                         attrs {
                             this.id = headerID
diff --git a/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/js/react.kt b/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/js/react.kt
index 0138393c..1ed93464 100644
--- a/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/js/react.kt
+++ b/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/js/react.kt
@@ -22,7 +22,7 @@ fun <P : RProps> component(
     }
 }
 
-fun <T> RFBuilder.initState(init: () -> T): ReadWriteProperty<Any?, T> =
+fun <T> RFBuilder.state(init: () -> T): ReadWriteProperty<Any?, T> =
     object : ReadWriteProperty<Any?, T> {
         val pair = react.useState(init)
         override fun getValue(thisRef: Any?, property: KProperty<*>): T {
diff --git a/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/vis/editor/ConfigEditorComponent.kt b/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/vis/editor/ConfigEditorComponent.kt
index 1a985f40..6da696f6 100644
--- a/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/vis/editor/ConfigEditorComponent.kt
+++ b/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/vis/editor/ConfigEditorComponent.kt
@@ -2,14 +2,12 @@ package hep.dataforge.vis.editor
 
 import hep.dataforge.js.RFBuilder
 import hep.dataforge.js.component
-import hep.dataforge.js.initState
-import hep.dataforge.js.memoize
+import hep.dataforge.js.state
 import hep.dataforge.meta.*
 import hep.dataforge.meta.descriptors.*
 import hep.dataforge.names.Name
 import hep.dataforge.names.NameToken
 import hep.dataforge.names.plus
-import hep.dataforge.values.Value
 import kotlinx.html.classes
 import kotlinx.html.js.onClickFunction
 import org.w3c.dom.Element
@@ -41,15 +39,15 @@ interface ConfigEditorProps : RProps {
 }
 
 private fun RFBuilder.configEditorItem(props: ConfigEditorProps) {
-    var expanded: Boolean by initState { true }
-    val item = memoize(props.root, props.name) { props.root[props.name] }
-    val descriptorItem: ItemDescriptor? = memoize(props.descriptor, props.name) { props.descriptor?.get(props.name) }
-    val defaultItem = memoize(props.default, props.name) { props.default?.get(props.name) }
+    var expanded: Boolean by state { true }
+    val item = props.root[props.name]
+    val descriptorItem: ItemDescriptor? = props.descriptor?.get(props.name)
+    val defaultItem = props.default?.get(props.name)
     val actualItem: MetaItem<Meta>? = item ?: defaultItem ?: descriptorItem?.defaultItem()
 
     val token = props.name.last()?.toString() ?: "Properties"
 
-    var kostyl by initState { false }
+    var kostyl by state { false }
 
     fun update() {
         kostyl = !kostyl
@@ -73,20 +71,6 @@ private fun RFBuilder.configEditorItem(props: ConfigEditorProps) {
         update()
     }
 
-    val valueChanged: (Value?) -> Unit = { value ->
-        try {
-            if (value == null) {
-                props.root.remove(props.name)
-            } else {
-                props.root.setValue(props.name, value)
-            }
-            update()
-        } catch (ex: Exception) {
-            console.error("Can't set config property ${props.name} to $value")
-        }
-    }
-
-
     when (actualItem) {
         is MetaItem.NodeItem -> {
             div {
@@ -127,37 +111,30 @@ private fun RFBuilder.configEditorItem(props: ConfigEditorProps) {
         }
         is MetaItem.ValueItem -> {
             div {
-                div("row") {
-                    div("col") {
-                        p("tree-label") {
-                            +token
+                div("d-flex flex-row align-items-center") {
+                    div("flex-grow-1 p-1 mr-auto tree-label") {
+                        +token
+                        attrs {
+                            if (item == null) {
+                                classes += "tree-label-inactive"
+                            }
+                        }
+                    }
+                    div("d-inline-flex") {
+                        valueChooser(props.root, props.name, actualItem.value, descriptorItem as? ValueDescriptor)
+                    }
+                    div("d-inline-flex p-1") {
+                        button(classes = "btn btn-link") {
+                            +"\u00D7"
                             attrs {
                                 if (item == null) {
-                                    classes += "tree-label-inactive"
+                                    disabled = true
+                                } else {
+                                    onClickFunction = removeClick
                                 }
                             }
                         }
                     }
-                    div("col") {
-                        child(ValueChooser) {
-                            attrs {
-                                this.value = actualItem.value
-                                this.descriptor = descriptorItem as? ValueDescriptor
-                                this.valueChanged = valueChanged
-                            }
-                        }
-                    }
-                    button(classes = "btn btn-link") {
-                        +"\u00D7"
-                        attrs {
-                            if (item == null) {
-                                disabled = true
-                            } else {
-                                onClickFunction = removeClick
-                            }
-                        }
-                    }
-
                 }
             }
         }
diff --git a/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/vis/editor/ObjectTree.kt b/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/vis/editor/ObjectTree.kt
index 54891cc0..af4faaa9 100644
--- a/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/vis/editor/ObjectTree.kt
+++ b/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/vis/editor/ObjectTree.kt
@@ -3,7 +3,7 @@ package hep.dataforge.vis.editor
 import hep.dataforge.js.RFBuilder
 import hep.dataforge.js.card
 import hep.dataforge.js.component
-import hep.dataforge.js.initState
+import hep.dataforge.js.state
 import hep.dataforge.names.Name
 import hep.dataforge.names.plus
 import hep.dataforge.names.startsWith
@@ -29,7 +29,7 @@ interface TreeState : RState {
 }
 
 private fun RFBuilder.objectTree(props: ObjectTreeProps): Unit {
-    var expanded: Boolean by initState{ props.selected?.startsWith(props.name) ?: false }
+    var expanded: Boolean by state{ props.selected?.startsWith(props.name) ?: false }
 
     val onClick: (Event) -> Unit = {
         expanded = !expanded
diff --git a/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/vis/editor/ValueChooser.kt b/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/vis/editor/valueChooser.kt
similarity index 56%
rename from dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/vis/editor/ValueChooser.kt
rename to dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/vis/editor/valueChooser.kt
index 642c7ee4..9b71a03a 100644
--- a/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/vis/editor/ValueChooser.kt
+++ b/dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/vis/editor/valueChooser.kt
@@ -1,9 +1,11 @@
 package hep.dataforge.vis.editor
 
-import hep.dataforge.js.component
+import hep.dataforge.meta.Config
 import hep.dataforge.meta.descriptors.ValueDescriptor
 import hep.dataforge.meta.get
+import hep.dataforge.meta.setValue
 import hep.dataforge.meta.string
+import hep.dataforge.names.Name
 import hep.dataforge.values.*
 import hep.dataforge.vis.widgetType
 import kotlinx.html.InputType
@@ -11,51 +13,10 @@ import kotlinx.html.js.onChangeFunction
 import org.w3c.dom.HTMLInputElement
 import org.w3c.dom.HTMLSelectElement
 import org.w3c.dom.events.Event
-import react.RProps
-import react.RState
-import react.dom.div
-import react.dom.input
-import react.dom.option
-import react.dom.select
-
-interface ValueChooserProps : RProps {
-    var value: Value
-    var descriptor: ValueDescriptor?
-    var valueChanged: (Value?) -> Unit
-}
-
-interface ValueChooserState : RState {
-    var value: Value
-}
-
-//class TextValueChooser(props: ValueChooserProps) : RComponent<ValueChooserProps, ValueChooserState>(props) {
-//
-//    override fun ValueChooserState.init(props: ValueChooserProps) {
-//        this.value = props.value
-//    }
-//
-//    val valueChanged: (Event) -> Unit = {
-//        val res = (it.target as HTMLInputElement).value.asValue()
-//        setState {
-//            this.value = res
-//        }
-//        props.valueChanged(res)
-//    }
-//
-//    override fun RBuilder.render() {
-//        input(type = InputType.text, classes = "float-right") {
-//            attrs {
-//                this.value = state.value.string
-//                onChangeFunction = valueChanged
-//            }
-//        }
-//    }
-//}
-
-val ValueChooser = component<ValueChooserProps> { props ->
-//    var state by initState {props.value }
-    val descriptor = props.descriptor
+import react.RBuilder
+import react.dom.*
 
+internal fun RBuilder.valueChooser(root: Config, name: Name, value: Value, descriptor: ValueDescriptor?) {
     val onValueChange: (Event) -> Unit = {
         val res = when (val t = it.target) {
             // (it.target as HTMLInputElement).value
@@ -67,22 +28,26 @@ val ValueChooser = component<ValueChooserProps> { props ->
             is HTMLSelectElement -> t.value.asValue()
             else -> error("Unknown event target: $t")
         }
-//        state = res
-        props.valueChanged(res)
+
+        try {
+            root.setValue(name, res)
+        } catch (ex: Exception) {
+            console.error("Can't set config property ${name} to $res")
+        }
     }
 
-    div {
+    div() {
         val type = descriptor?.type?.firstOrNull()
         when {
             type == ValueType.BOOLEAN -> {
-                input(type = InputType.checkBox, classes = "float-right") {
+                input(type = InputType.checkBox) {
                     attrs {
-                        checked = props.value.boolean
+                        checked = value.boolean
                         onChangeFunction = onValueChange
                     }
                 }
             }
-            type == ValueType.NUMBER -> input(type = InputType.number, classes = "float-right") {
+            type == ValueType.NUMBER -> input(type = InputType.number, classes = "form-control w-100") {
                 attrs {
                     descriptor.attributes["step"].string?.let {
                         step = it
@@ -93,11 +58,11 @@ val ValueChooser = component<ValueChooserProps> { props ->
                     descriptor.attributes["max"].string?.let {
                         max = it
                     }
-                    this.value = props.value.string
+                    this.defaultValue = value.string
                     onChangeFunction = onValueChange
                 }
             }
-            descriptor?.allowedValues?.isNotEmpty() ?: false -> select("float-right") {
+            descriptor?.allowedValues?.isNotEmpty() ?: false -> select (classes = "w-100") {
                 descriptor!!.allowedValues.forEach {
                     option {
                         +it.string
@@ -108,19 +73,18 @@ val ValueChooser = component<ValueChooserProps> { props ->
                     onChangeFunction = onValueChange
                 }
             }
-            descriptor?.widgetType == "color" -> input(type = InputType.color, classes = "float-right") {
+            descriptor?.widgetType == "color" -> input(type = InputType.color) {
                 attrs {
-                    this.value = props.value.string
+                    this.value = value.string
                     onChangeFunction = onValueChange
                 }
             }
-            else -> input(type = InputType.text, classes = "float-right") {
+            else -> input(type = InputType.text, classes = "form-control w-100") {
                 attrs {
-                    this.value = props.value.string
+                    this.value = value.string
                     onChangeFunction = onValueChange
                 }
             }
         }
     }
-
 }
\ No newline at end of file
diff --git a/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/Material3D.kt b/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/Material3D.kt
index a8cb0a11..71766435 100644
--- a/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/Material3D.kt
+++ b/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/Material3D.kt
@@ -56,12 +56,10 @@ class Material3D : Scheme() {
                 defineValue(OPACITY_KEY) {
                     type(ValueType.NUMBER)
                     default(1.0)
-                    configure {
-                        "attributes" to {
-                            this["min"] = 0.0
-                            this["max"] = 1.0
-                            this["step"] = 0.1
-                        }
+                    config["attributes"] = Meta {
+                        this["min"] = 0.0
+                        this["max"] = 1.0
+                        this["step"] = 0.1
                     }
                 }
                 defineValue(WIREFRAME_KEY) {
diff --git a/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/VisualObject3D.kt b/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/VisualObject3D.kt
index 1a4c5360..8cd0369d 100644
--- a/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/VisualObject3D.kt
+++ b/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/VisualObject3D.kt
@@ -68,18 +68,13 @@ interface VisualObject3D : VisualObject {
                     default(true)
                 }
 
-                defineItem(Material3D.MATERIAL_KEY.toString(), Material3D.descriptor)
-
                 //TODO replace by descriptor merge
                 defineValue(VisualObject.STYLE_KEY){
                     type(ValueType.STRING)
                     multiple = true
                 }
 
-//                Material3D.MATERIAL_COLOR_KEY put "#ffffff"
-//                Material3D.MATERIAL_OPACITY_KEY put 1.0
-//                Material3D.MATERIAL_WIREFRAME_KEY put false
-
+                defineItem(Material3D.MATERIAL_KEY.toString(), Material3D.descriptor)
             }
         }
     }
diff --git a/dataforge-vis-spatial/src/jsMain/kotlin/hep/dataforge/vis/spatial/three/ThreeCanvas.kt b/dataforge-vis-spatial/src/jsMain/kotlin/hep/dataforge/vis/spatial/three/ThreeCanvas.kt
index b7fcae95..0a49e96a 100644
--- a/dataforge-vis-spatial/src/jsMain/kotlin/hep/dataforge/vis/spatial/three/ThreeCanvas.kt
+++ b/dataforge-vis-spatial/src/jsMain/kotlin/hep/dataforge/vis/spatial/three/ThreeCanvas.kt
@@ -109,10 +109,10 @@ class ThreeCanvas(element: HTMLElement, val three: ThreePlugin, val canvas: Canv
 
         element.appendChild(renderer.domElement)
 
-        renderer.setSize(max(canvas.minSize, element.offsetWidth), max(canvas.minSize, element.offsetWidth))
+        renderer.setSize(max(canvas.minSize, element.clientWidth), max(canvas.minSize, element.clientWidth))
 
-        element.onresize = {
-            renderer.setSize(element.offsetWidth, element.offsetWidth)
+        window.onresize = {
+            renderer.setSize(element.clientWidth, element.clientWidth)
             camera.updateProjectionMatrix()
         }
 
diff --git a/demo/muon-monitor/src/jsMain/kotlin/ru/mipt/npm/muon/monitor/MMAppComponent.kt b/demo/muon-monitor/src/jsMain/kotlin/ru/mipt/npm/muon/monitor/MMAppComponent.kt
index 87f3f124..bf05be52 100644
--- a/demo/muon-monitor/src/jsMain/kotlin/ru/mipt/npm/muon/monitor/MMAppComponent.kt
+++ b/demo/muon-monitor/src/jsMain/kotlin/ru/mipt/npm/muon/monitor/MMAppComponent.kt
@@ -3,7 +3,7 @@ package ru.mipt.npm.muon.monitor
 import hep.dataforge.context.Context
 import hep.dataforge.js.card
 import hep.dataforge.js.component
-import hep.dataforge.js.initState
+import hep.dataforge.js.state
 import hep.dataforge.names.Name
 import hep.dataforge.names.NameToken
 import hep.dataforge.names.isEmpty
@@ -40,17 +40,21 @@ private val canvasConfig = Canvas {
 }
 
 val MMApp = component<MMAppProps> { props ->
-    var selected by initState { props.selected }
-    var canvas: ThreeCanvas? by initState { null }
+    var selected by state { props.selected }
+    var canvas: ThreeCanvas? by state { null }
 
     val select: (Name?) -> Unit = {
         selected = it
     }
 
     val visual = props.model.root
-
     div("row") {
-        div("col-lg-3") {
+        h1("mx-auto") {
+            +"Muon monitor demo"
+        }
+    }
+    div("row") {
+        div("col-lg-3 mh-100 px-0") {
             //tree
             card("Object tree") {
                 objectTree(visual, selected, select)
@@ -156,5 +160,6 @@ val MMApp = component<MMAppProps> { props ->
                 }
             }
         }
+
     }
 }
\ No newline at end of file
diff --git a/demo/muon-monitor/src/jsMain/resources/index.html b/demo/muon-monitor/src/jsMain/resources/index.html
index 9d5118c6..a229b2a9 100644
--- a/demo/muon-monitor/src/jsMain/resources/index.html
+++ b/demo/muon-monitor/src/jsMain/resources/index.html
@@ -11,25 +11,6 @@
     <script type="text/javascript" src ="js/bootstrap.bundle.min.js"></script>
 </head>
 <body class="testApp">
-
-<div class="container">
-    <h1>Muon monitor demo</h1>
-</div>
-
-<div class="container-fluid">
-    <div id="app"></div>
-<!--    <div class="row">
-        <div class="col-lg-3">
-            <div class="row" id="tree"></div>
-        </div>
-        <div class="col-lg-6">
-            <div id="canvas"></div>
-        </div>
-        <div class="col-lg-3">
-            <div class="row" id="settings"></div>
-            <div class="row" id="editor"></div>
-        </div>
-    </div>-->
-</div>
+<div class="container-fluid" id = "app"> </div>
 </body>
 </html>
\ No newline at end of file