delphi如何防止MDI孩子最大化？

Win32Check(Windows.GetClientRect(ClientHandle, aTRect));

MDIChild1.BoundsRect := aTRect;

功能.

那么,当按下最大化按钮时,我们如何防止MDI子项被最大化？

我试过用它来做

procedure TChildText.WMSYSCOMMAND(var Message: TWMSYSCOMMAND);
var
  aTRect:TRect;
begin
  inherited;
  case message.CmdType of
    SC_MAXIMIZE: 
      begin
        Win32Check(Windows.GetClientRect(MainForm.ClientHandle, aTRect));
        BoundsRect := aTRect;
      end;
  end;
end;

没有结果.

procedure TChildText.WMSYSCOMMAND(var Message: TWMSYSCOMMAND);
var
  aTRect:TRect;
begin
  if message.CmdType = SC_MAXIMIZE then
  begin
    Win32Check(Windows.GetClientRect(MainForm.ClientHandle, aTRect));
    BoundsRect := aTRect;
    message.CmdType := SC_RESTORE;
  end;
  inherited;
end;