Occurs when the selection is about to change from one node to another.
property OnChanging;
Write an OnChanging event handler to selectively prevent selection from moving to specific nodes.
The TTVChangingEvent type points to a method that is called when the selection is about to be changed from one node to another. Set AllowChange to false, to prevent selection from moving to a new node. The Node parameter specifies the node that is about to be selected.
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