Avoid errors when target control is not found.
#TargetControlError OnOff
When parameter is omitted, it defaults to Off. On/1 = throw if control not found, Off/0 = don't throw if control not found.
#TargetControlError (myGui:=Gui()).Show() ControlFocus "this control does not exist and no error is shown","ahk_id " myGui.hwnd myGui.Destroy()