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Change the Window Style for a control

The CreateParams method is used to set up the window style and all the other arguments
that are passed to CreateWindowEx to create the control's
To change the window style use something like this which creates a window with or
without a vertical scroll bar.

procedure TMyControl.CreateParams(var Params: TCreateParams) ; 
   inherited CreateParams (Params) ; 
   if IWantAScrollBar then 
     Params.Style := Params.Style or WS_VSCROLL 
     Params.Style := Params.Style and not WS_VSCROLL ; 

Generated 8:01:57 on Dec 19, 2018