如何使CMFCToolBar识别图像遮罩?

CMFCToolBar -派生类及其派生类是 CDockablePane -派生类。

我查看了VisualStudioDemo示例以了解它是如何完成的,到目前为止:

int CMyPane::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    // Removed all "return -1 on error" code for better readability

    CDockablePane::OnCreate(lpCreateStruct);

    if(m_toolBar.Create(this, AFX_DEFAULT_TOOLBAR_STYLE, IDR_MY_TOOLBAR) &&
       m_toolBar.LoadToolBar(IDR_MY_TOOLBAR, 0, 0, TRUE /* Is locked */))
    {

        if(theApp.m_bHiColorIcons) // Is true, i.e. following code is executed
        {
            m_toolBar.CleanUpLockedImages();
            m_toolBar.LoadBitmap(IDB_MY_TOOLBAR_24, 0, 0, TRUE /*Locked*/);
        }

        m_toolBar.SetPaneStyle(m_toolBar.GetPaneStyle() | CBRS_TOOLTIPS | CBRS_FLYBY);
        m_toolBar.SetPaneStyle(m_toolBar.GetPaneStyle() & ~(CBRS_GRIPPER | CBRS_SIZE_DYNAMIC | CBRS_BORDER_TOP | CBRS_BORDER_BOTTOM | CBRS_BORDER_LEFT | CBRS_BORDER_RIGHT));

        m_toolBar.SetOwner(this);

        // All commands will be routed via this control , not via the parent frame:
        m_toolBar.SetRouteCommandsViaFrame(FALSE);
    }

    return 0;
}

高颜色图像(24位)已加载,但洋红遮罩(R255 G0 B255)可见。我不知道如何告诉工具栏识别掩码。