VOID NC_TrackScrollBar(HWND Wnd, WPARAM wParam, POINT Pt);
void ThemeInitDrawContext(PDRAW_CONTEXT pcontext, HWND hWnd, HRGN hRgn);
void ThemeCleanupDrawContext(PDRAW_CONTEXT pcontext);
VOID NC_TrackScrollBar(HWND Wnd, WPARAM wParam, POINT Pt);
void ThemeInitDrawContext(PDRAW_CONTEXT pcontext, HWND hWnd, HRGN hRgn);
void ThemeCleanupDrawContext(PDRAW_CONTEXT pcontext);