TreeList.BeforeFocusNode Event

The event handler receives an argument of type BeforeFocusNodeEventArgs containing data related to this event.

The BeforeFocusNode event is raised each time a node is about to lose focus. The previously and currently focused nodes can be identified by the event parameter's NodeEventArgs.Node and FocusedNodeChangedEventArgs.OldNode properties, respectively. The BeforeFocusNodeEventArgs.CanFocus property specifies whether the node can be focused. To prevent node focus changing, set this property to false.

Once the focused node has been changed, the FocusedNodeChanged and AfterFocusNode events are raised.

Example

private void treeList1_BeforeFocusNode(object sender, 
DevExpress.XtraTreeList.BeforeFocusNodeEventArgs e) {
   if (e.Node.Id == (sender as TreeList).Nodes[0].Id) 
      e.CanFocus = false;
}

Private Sub TreeList1_BeforeFocusNode(ByVal sender As Object, 
ByVal e As DevExpress.XtraTreeList.BeforeFocusNodeEventArgs) 
Handles TreeList1.BeforeFocusNode
   If e.Node.Id = TryCast(sender, TreeList).Nodes(0).Id Then 
      e.CanFocus = False 
   End If 
End Sub