public long DragWindowFun(IntPtr es)
{
Lib.ReleaseCapture();
Point DownPoint = new Point();
Lib.GetCursorPos(ref DownPoint);
Lib.SendMessage(ltf.windowHandle(), 0x00A1, 2, (DownPoint.X & 0xFFFF) + (DownPoint.Y & 0xFFFF) * 0x10000);
return(ltf.JsUndefined());
}