Displaying icon in the left of custom control on t

I wrote code that put the custom control on tool bar.
Because I wanted to display the icon in the left of the custom control in OnCreateControl, the following codes were added.

int CMainFrame::OnCreateControl( LPCREATECONTROLSTRUCT lpsCreateControl )
{
     int          nRet = FALSE ;

     switch( lpsCreateControl->nID )
     {
          case IDC_XXX :
          {
               lpsCreateControl->pControl          = CXTPControlCustom::CreateControlCustom( &m_ctrlCustom ) ;
               lpsCreateControl->controlType     = xtpControlCustom ;
               lpsCreateControl->buttonStyle     = xtpButtonIcon ;

               nRet = TRUE ;
               break ;
          }
     }

    :
    :
}

However, the icon was not displayed.
Isn't there method of solving this problem?

I think about the another way about this problem.
I am in the next version is expected to be displayed icons.

Thankyou.