public void DecorationMouseUp(HitTestValues hit, Point p)
{
NativeMethods.ReleaseCapture();
var pt = new POINTS { X = (short)p.X, Y = (short)p.Y };
NativeMethods.SendMessage(Handle, (int)WindowMessages.WM_NCLBUTTONUP, (int)hit, pt);
}
public static extern int SendMessage(IntPtr hwnd, int msg, int wparam, POINTS pos);