WeifenLuo.WinFormsUI.Docking.FloatWindow.IDockDragSource C# (CSharp) Метод

        Rectangle IDockDragSource.BeginDrag(Point ptMouse)
        {
            m_preDragExStyle = NativeMethods.GetWindowLong(this.Handle, (int)Win32.GetWindowLongIndex.GWL_EXSTYLE);
            NativeMethods.SetWindowLong(this.Handle,
                                        (int)Win32.GetWindowLongIndex.GWL_EXSTYLE,
                                        m_preDragExStyle | (int)(Win32.WindowExStyles.WS_EX_TRANSPARENT | Win32.WindowExStyles.WS_EX_LAYERED) );
            return Bounds;
        }