How do I change a tool bar button style after creation?

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C++

MFC

The following code segment is part of the OnCreate Handler of an MFC application whose starting codes were generated by wizard.
(The code is not well formatted. I don't ever see the Question Formating code bar when I try to post a question any longer).

m_wndToolBar is a member of type CMFCToolBar.


int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
     .
     .
     .
     .

     if (!m_wndToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP | CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) ||
		!m_wndToolBar.LoadToolBar(theApp.m_bHiColorIcons ? IDR_MAINFRAME_256 : IDR_MAINFRAME))
	{
		TRACE0("Failed to create toolbar\n");

		HCURSOR hCursor = AfxGetApp()->LoadStandardCursor(IDC_ARROW); 
		SetCursor(hCursor);
		return -1;      // fail to create
	}
        
     //I attempted to add a separator and change button style but nothing happened
	int iCount = m_wndToolBar.GetCount();
	m_wndToolBar.InsertSeparator(8);

	for(int i = 9; i < iCount; i++)
	{
		m_wndToolBar.SetButtonStyle(i,TBBS_SEPARATOR);
	}
        .
        .
        .
        .
        .
}