RAD Studio VCL Reference
TButtonGroup.OnContextPopup Event

Occurs when a user right-clicks on the dock site to display the popup menu.

property OnContextPopup: TContextPopupEvent;
__property TContextPopupEvent OnContextPopup;

Any action you add to this event may occur prior to the popup menu being displayed. You can test this yourself by adding a ShowMessage command to the event handler and running the application. 


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