void CChildFrame::OnSize(UINT nType, int cx, int cy)
{
CMDIChildWnd::OnSize(nType, cx, cy);
CRect rect;
GetWindowRect( &rect );
if( m_bSplitterCreated ) // m_bSplitterCreated set in OnCreateClient
{
m_wndSplitter.SetColumnInfo(0, rect.Width()/2, 10);
m_wndSplitter.SetColumnInfo(1, rect.Width()/2, 10);
m_wndSplitter.RecalcLayout();
}
}