Author: Jonas Bilinkevicius

I try to disable the ability to move MDI children around. Problem is that if I have 
tiled for example 2 MDI's, I cannot change focus to another one.

Answer:

1   procedure TForm1.WMSyscommand(var msg: TWMSyscommand);
2   begin
3     if (msg.cmdtype and $FFF0) <> SC_MOVE then
4       inherited;
5   end;