Genexus

Habia borrado un nodo en el WorkWith.
Hice Ctrl-z porque me habia equivocado.

Luego volvi a borrar otro nodo y me dio el error:

===================================

Index was out of range. Must be non-negative and less than the size of
the collection.
Parameter name: index (mscorlib)

------------------------------
Product = GeneXus X Evolution 2
Version = 10.2.42111 Beta 2

------------------------------
Program Location:

at System.Collections.ArrayList.get_Item(Int32 index)
at Infragistics.Win.UltraWinTree.NodeClientAreaUIElement.PositionChildElements()
at Infragistics.Win.UIElement.VerifyChildElements(ControlUIElementBase
controlElement, Boolean recursive)
at Infragistics.Win.UIElement.VerifyChildElements(Boolean recursive)
at Infragistics.Win.UIElement.VerifyChildElements()
at Infragistics.Win.UltraWinTree.UltraTreeUIElement.PositionChildElements()
at Infragistics.Win.UIElement.VerifyChildElements(ControlUIElementBase
controlElement, Boolean recursive)
at Infragistics.Win.UIElement.VerifyChildElements(Boolean recursive)
at Infragistics.Win.UltraWinTree.UltraTreeNode.BringIntoViewHelper(Boolean
includeChildNodes, Boolean includeHorizontal, Boolean includeVertical,
Boolean leftOnly)
at Infragistics.Win.UltraWinTree.UltraTreeNode.BringIntoViewHelper(Boolean
includeChildNodes, Boolean includeHorizontal)
at Infragistics.Win.UltraWinTree.UltraTree.SetActiveNode(UltraTreeNode
node, Boolean bringIntoView, Boolean adjustHorizontalPosition)
at Infragistics.Win.UltraWinTree.UltraTree.set_ActiveNode(UltraTreeNode
value)
at Infragistics.Win.UltraWinTree.TreeNodesCollection.Remove(UltraTreeNode
value, Boolean verifyBound)
at Infragistics.Win.UltraWinTree.TreeNodesCollection.Remove(UltraTreeNode
value)
at Infragistics.Win.UltraWinTree.UltraTreeNode.InternalRemove()
at Infragistics.Win.UltraWinTree.UltraTreeNode.Remove()
at Artech.Packages.Patterns.UI.Editor.InstanceTreeView.RegenerateSubtree(UltraTreeNode
node, Boolean doRecursively)
at Artech.Packages.Patterns.UI.Editor.InstanceTreeView.RegenerateSubtree(PatternInstanceElement
fromElement, Boolean doRecursively)
at Artech.Packages.Patterns.UI.Editor.InstanceEditorControl.RefreshView(PatternInstanceElement
from)
at Artech.Packages.Patterns.UI.Editor.CompositeInstanceEditorControl.RefreshView(PatternInstanceElement
from)
at Artech.Packages.Patterns.UI.Editor.CompositeInstanceEditorControl.CommandManager_AfterCommand(Object
sender, EventArgs`1 e)
at Artech.Packages.Patterns.UI.Editor.InstanceEditorCommandManager.OnAfterCommand(IList`1
itemsAffected)

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