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function ControlHasFocus(ControlHandle: HWND): Boolean;
var FGW: HWND;
begin
  FGW:= GetForeGroundWindow;
  AttachThreadInput(GetCurrentThreadID, //thread to attach
                    GetWindowThreadProcessID(FGW) //thread to attach to
                    true); //attach or detach
  result:= (ControlHandle = GetFocus);
  AttachThreadInput(GetCurrentThreadID, //thread to attach
                    GetWindowThreadProcessID(FGW) //thread to attach to
                    false); //attach or detach
end;