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TDesignerObjTree Properties, TDesignerObjTree Class
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TDesignerObjTree.OnChanging Property
TDesignerObjTree Properties | TDesignerObjTree Class
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Occurs when the selection is about to change from one node to another.

property OnChanging;
Description

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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