Coloring thumbs on CScrollBar

[mesajflaviu]

I am trying to coloring thumbs on CScrollBar control ... in order to achieve that, I derived a class from CScrollBar, named CScrollbarExt, and I handled CtlColor:

protected:
	//{{AFX_MSG(CScrollBarExt)
	afx_msg HBRUSH CtlColor(CDC* pDC, UINT nCtlColor);
	//}}AFX_MSG

and

HBRUSH CScrollBarExt::CtlColor(CDC* pDC, UINT nCtlColor) 
{
	// TODO: Change any attributes of the DC here

	// TODO: Return a non-NULL brush if the parent's handler should not be called
	return m_Brush;
	return NULL;
}

of course, m_Brush has a custom color, and scrollbar shaft has custom color ... but how can I draw thumbs of this CScrollBar object ? What can I do for that ?
I attach a little sample project to illustrate the issue ...