在运行时移动控件

procedure TForm1.Button1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
const
  SC_DragMove = $F012;
begin
  Begin
   ReleaseCapture;
   Button1.perform(WM_SysCommand, SC_DragMove, 0);
  End;
end;