diff --git a/numass-core/src/main/kotlin/inr/numass/data/storage/NumassStorage.kt b/numass-core/src/main/kotlin/inr/numass/data/storage/NumassStorage.kt
index bb257f10..e6eb8b80 100644
--- a/numass-core/src/main/kotlin/inr/numass/data/storage/NumassStorage.kt
+++ b/numass-core/src/main/kotlin/inr/numass/data/storage/NumassStorage.kt
@@ -49,11 +49,11 @@ class NumassStorage : FileStorage {
     val description: String
         get() = meta.getString("description", "")
 
-    private constructor(parent: FileStorage, config: Meta, shelf: String) : super(parent, config, shelf) {
-        refresh()
-    }
+    private constructor(parent: FileStorage, config: Meta, shelf: String) : super(parent, config, shelf)
 
-    constructor(context: Context, config: Meta, path: Path) : super(context, config, path) {
+    constructor(context: Context, config: Meta, path: Path) : super(context, config, path)
+
+    init {
         refresh()
     }
 
diff --git a/numass-viewer/src/main/kotlin/inr/numass/viewer/AmplitudeView.kt b/numass-viewer/src/main/kotlin/inr/numass/viewer/AmplitudeView.kt
index b156f7b9..5d8f873e 100644
--- a/numass-viewer/src/main/kotlin/inr/numass/viewer/AmplitudeView.kt
+++ b/numass-viewer/src/main/kotlin/inr/numass/viewer/AmplitudeView.kt
@@ -149,7 +149,7 @@ class AmplitudeView : View(title = "Numass amplitude spectrum plot", icon = Imag
                                     spectrum.withBinning(binning),
                                     adapter
                             )
-                            group.set(plot)
+                            group.add(plot)
                         }
                         group
                     }
diff --git a/numass-viewer/src/main/kotlin/inr/numass/viewer/SlowControlView.kt b/numass-viewer/src/main/kotlin/inr/numass/viewer/SlowControlView.kt
index 003d7a1e..f99610ea 100644
--- a/numass-viewer/src/main/kotlin/inr/numass/viewer/SlowControlView.kt
+++ b/numass-viewer/src/main/kotlin/inr/numass/viewer/SlowControlView.kt
@@ -14,6 +14,7 @@ import hep.dataforge.storage.api.ValueIndex
 import hep.dataforge.tables.Adapters
 import hep.dataforge.tables.ListTable
 import hep.dataforge.tables.Table
+import hep.dataforge.toList
 import hep.dataforge.values.Values
 import javafx.collections.FXCollections
 import javafx.collections.MapChangeListener
@@ -59,7 +60,7 @@ class SlowControlView : View(title = "Numass slow control view", icon = ImageVie
                             "showSymbol" to false
                             "showErrors" to false
                         }
-                        group.set(plot)
+                        group.add(plot)
                     }
                     group
                 } ui {
@@ -80,7 +81,7 @@ class SlowControlView : View(title = "Numass slow control view", icon = ImageVie
                     loader.index
                 }
         try {
-            return ListTable(loader.format, index.query(query))
+            return ListTable(loader.format, index.query(query).toList())
         } catch (e: Exception) {
             throw RuntimeException(e)
         }
diff --git a/numass-viewer/src/main/kotlin/inr/numass/viewer/StorageView.kt b/numass-viewer/src/main/kotlin/inr/numass/viewer/StorageView.kt
index 4d7762a8..1710e07e 100644
--- a/numass-viewer/src/main/kotlin/inr/numass/viewer/StorageView.kt
+++ b/numass-viewer/src/main/kotlin/inr/numass/viewer/StorageView.kt
@@ -62,7 +62,7 @@ class StorageView(val storage: Storage) : View(title = "Numass storage", icon =
                     }
                     is TableLoader -> {
                         if (selected) {
-                            scView.set(id, content)
+                            scView[id] = content
                         } else {
                             scView.remove(id)
                         }