internal static extern int DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS margins);
/// <summary>
/// Extends the window frame into the client area.
/// </summary>
/// <param name="hWnd">The window handle whose client area to extend the window frame into.</param>
/// <param name="margins">The amount of window frame to extend around the client area.</param>
/// <returns>S_OK on success; otherwise, an HRESULT error code.</returns>
public static int ExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS margins)
{
return(NativeMethods.DwmExtendFrameIntoClientArea(hWnd, ref margins));
}