ShellBrowser Delphi Components Documentation
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Jam.Shell.Controls.ExplorerBrowser.TJamExplorerBrowser.OnBeforeDefaultAction

Like OnDefaultAction, this event is called before the user double-clicks, presses Enter or selects the default context menu command for an element in the ShellView. Using the "Cancel" parameter you the action can be intercepted and stopped.

Syntax
Pascal
property OnBeforeDefaultAction: TCancelEvent;