public IntPtr?GetThemeBitmap(int partId, int stateId, int propertyId)
{
HResult hr = UxThemeExNativeMethods.UxGetThemeBitmap(
themeFile, theme, partId, stateId, propertyId, GBF.GBF_DIRECT, out IntPtr value);
return(hr.Succeeded() ? value : (IntPtr?)null);
}