public static extern IntPtr GetThemePartSize(IntPtr hTheme, IntPtr hdc, ThemeParts iPartId, int iStateId,
IntPtr prc, THEMESIZE eSize, out SIZE psz);
public static extern IntPtr GetThemeMetric(IntPtr hTheme, IntPtr hdc, ThemeParts iPartId,
int iStateId, UxThemeProperties iPropId, ref int piVal);
public static extern IntPtr GetThemePartSize(IntPtr hTheme, IntPtr hdc, ThemeParts iPartId, int iStateId,
[MarshalAs(UnmanagedType.Struct)] SIZE prc, THEMESIZE eSize, out SIZE psz);
public static extern IntPtr DrawThemeBackground(IntPtr hTheme, IntPtr hdc,
ThemeParts part, int iStateId, RECT pRect, RECT pClipRect);