I just want to let wmlanza know that this solution worked out perfectly for my needs.  Thanks for sharing!

Hi,

If I change SelectedNode myself in the viewmodel to an other TreeNode the selection is not changed.

Is this the default behavior or I'm wrong.

Thanks

Forget it. I figured it out :

My View Model was wrong. The property should have been of Type XamDataTreeNode instead of the class for the Data of the Node

Hi. I created a class that inherits XamDataTree with a dependency property for the SelectedNode. I overrode the OnActiveNodeChanged event and set the new property. However my view model is not seeing the change. I am wondering if I am missing something.  Any help would be appreciated.

Here is the XamTree class

Public Class XamDataTreeExtended
    Inherits XamDataTree
 
    Public Shared ReadOnly SelectedNodeProperty As DependencyProperty = DependencyProperty.Register("SelectedNode", GetType(XamDataTreeNode), GetType(XamDataTreeExtended), New PropertyMetadata(AddressOf SelectedNodeChanged))
 
    Public Property SelectedNode() As XamDataTreeNode
        Get
            Return CType(GetValue(SelectedNodeProperty), XamDataTreeNode)
        End Get
        Set(ByVal value As XamDataTreeNode)
            SetValue(SelectedNodeProperty, value)
        End Set
    End Property
 
    Private Shared Sub SelectedNodeChanged(ByVal s As DependencyObject, ByVal args As DependencyPropertyChangedEventArgs)
        'do nothing
        Dim tree = DirectCast(s, XamDataTreeExtended)
        tree.OnPropertyChanged("SelectedNode")
    End Sub
 
    Protected Overrides Sub OnActiveNodeChanged(args As Infragistics.Controls.Menus.ActiveNodeChangedEventArgs)
        SelectedNode = Me.ActiveNode
        MyBase.OnActiveNodeChanged(args)
    End Sub
End Class

Here is some of the Xaml for the tree:

<infra:XamDataTreeExtended x:Name="xamTree"
                                        AllowDrop="True"
                                        IsDropTarget="True"
                                        Grid.Row="0"
                                        ItemsSource="{Binding RootFolderContactsNode.SubItemsSorted}" 
                                        MaxHeight="550"
                                        NodeDragDrop="xamTree_NodeDragDrop"
                                        Background="Transparent"
                                        NodeLineVisibility="Visible"
                                        SelectedNode="{Binding SelectedNode, Mode=TwoWay}">

...

</infra:XamDataTreeExtended>

In my view model:

    Private _selectedNode As FolderContactTreeNode
    Public Property SelectedNode As FolderContactTreeNode
        Get
            Return _selectedNode
        End Get
        Set(value As FolderContactTreeNode)
            _selectedNode = value    '<----Not being Hit
            OnPropertyChanged("SelectedNode")
        End Set
    End Property

Thank you Stoimen!

I appreciate the quick response. That was just the piece of duct tape I needed to get it all working!

Hopefully this post can help others out there accomplish a similar thing until you build something into your control to handle it cleanly.

Thank you again.