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I implemented Dialog which contains ExtGridWnd like custom control with custom horizontal Scrollbars. I created scrollbar in PreSubclassWnd, and reposition in CCustomExtGridWnd::OnSize. Code look like

void CCustomExtGridCtrl::OnSize(UINT nType, int cx, int cy)
{
    CExtGridWnd::OnSize(nType, cx, cy);
    m_nBottomToolbarWidth=cx/2;
    int nOffsetV=::GetSystemMetrics(SM_CYHSCROLL);
    m_wndScrollBarH.MoveWindow(m_nBottomToolbarWidth,cy-nOffsetV,cx-m_nBottomToolbarWidth,nOffsetV);
}

When I try to resize dialog, old scroll bar apears as well as custom scrolls.Whats wrond with this code.

You need to override the CWnd::GetScrollBarCtrl() virtual method and return your scroll bar. This virtual method is used to detect whether the built-in scroll bar like non-client areas is needed. We recommend you use the CExtScrollBar window which automatically docks with the border of the grid window and aligns other controls in the same row/column with it. The AdoRecordsetView sample application demonstrates how to use CExtScrollBar inside a CExtGridWnd-derived class.

Offcourse,I override GetScrollBarCtrl but instead of OnSize message i found that reposition scrolbar must be done in OnSwRecalcLayout override virtual method. And now it works fine.
Anyway thank You.