Event type for the Open event of the List
Source position: MUIClass.PopString.pas line 14
type TOpenPopEvent = function(  | 
Sender: TObject  | 
):Boolean of object;  | 
Sender  | 
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PopString send the Event  | 
When this hook returns TRUE, MUI assumes the popup was opened succesfully.
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Whenever the popup receives a Open() method, this event will be called  | 
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This method opens the popup.  |