CSliderCtrl Click

Hello,
I use a CSliderCtrl and the HScroll for the position change. This works well for move the thumb, but it do not work if I click into the line. Normaly if I click into the line, the tumb will go to this position. How I have to expand the HScroll that it will be work.
Attached the function I use currently.

Ocrana

void CAudioGrabSource::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
	if (pScrollBar->GetSafeHwnd() == mAGrabPlayPos.GetSafeHwnd())
	{
		switch (nSBCode)
		{
		case TB_PAGEDOWN:
			case SB_THUMBTRACK:
				m_bScrolling = true;
				break;

			case SB_THUMBPOSITION:
				m_cAudioTrackPlayer.Seek((float)mAGrabPlayPos.GetPos());
				break;
		
			case SB_ENDSCROLL:
				m_bScrolling = false;
				break;

			default:
				break;
		}
	}

	__super::OnHScroll(nSBCode, nPos, pScrollBar);
}

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