shellproperties OnBeforeMenuItemClick property
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Applies to
dcShellProperties component.  

  TdcBeforeMenuItemClickEvent = procedure(Sender: TObject; FileName: String; MenuItemID: Integer; var Discard: Boolean) of object;  
property OnBeforeMenuItemClick: TdcBeforeMenuItemClickEvent;  

The OnBeforeMenuItemClick event occurs after selecting the menu item from the context menu for shell object.  
The FileName parameter determines the name of the shell object, and MenuItemID determines the unique ID of selected menu item. If you would like to discard this operation - set Discard parameter to True in the event handler.  

See also
OnAfterMenuItemClick event.