Code:procedure WMGetMinMaxInfo(var MSG: Tmessage); message WM_GetMinMaxInfo; procedure TForm1.WMGetMinMaxInfo(var MSG: Tmessage); Begin inherited; with PMinMaxInfo(MSG.lparam)^ do begin with ptMinTrackSize do begin X := 300; Y := 150; end; with ptMaxTrackSize do begin X := 350; Y := 250; end; end; end;