procedure TForm1.GroupBoxMouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
ReleaseCapture;
TgroupBox(sender).perform(WM_SysCommand, $F012, 0);
end;
转载于:https://www.cnblogs.com/dpsw/archive/2011/08/16/2140571.html