Using Drop-Down Buttons in a Toolbar Control

In addition to standard push buttons, a toolbar can also have drop-down buttons. A drop-down button is usually indicated by the presence of an attached down arrow.


The attached down arrow will appear only if the TBSTYLE_EX_DRAWDDARROWS extended style has been set.

When the user clicks on this arrow (or the button itself, if no arrow is present), a TBN_DROPDOWN notification message is sent to the parent of the toolbar control. You can then handle this notification and display a pop-up menu; similar to the behavior of Internet Explorer.

The following procedure illustrates how to implement a drop-down toolbar button with a pop-up menu:

To implement a drop-down button

  1. Once your CToolBarCtrl object has been created, set the TBSTYLE_EX_DRAWDDARROWS style, using the following code:

  2. Set the TBSTYLE_DROPDOWN style for any new (InsertButton or AddButtons) or existing (SetButtonInfo) buttons that will be drop-down buttons. The following example demonstrates modifying an existing button in a CToolBarCtrl object:

    tbi.dwMask = TBIF_STYLE;
    tbi.cbSize = sizeof(TBBUTTONINFO);
    m_ToolBarCtrl.GetButtonInfo(0, &tbi);
    tbi.fsStyle |= TBSTYLE_DROPDOWN;
    m_ToolBarCtrl.SetButtonInfo(0, &tbi);
  3. Add a TBN_DROPDOWN handler to the parent class of the toolbar object.

    ON_NOTIFY(TBN_DROPDOWN, IDC_TOOLBAR1, &CMyDialog::OnTbnDropDownToolBar1)
  4. In the new handler, display the appropriate popup menu. The following code demonstrates one method:

    void CMyDialog::OnTbnDropDownToolBar1(NMHDR *pNMHDR, LRESULT *pResult)
       LPNMTOOLBAR pToolBar = reinterpret_cast<LPNMTOOLBAR>(pNMHDR);
       ClientToScreen(&(pToolBar->rcButton)); // TrackPopupMenu uses screen coords
       CMenu menu;
       CMenu *pPopup = menu.GetSubMenu(0);
       if (NULL != pPopup)
          pPopup->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON,
                                 pToolBar->rcButton.left, pToolBar->rcButton.bottom, this);
       *pResult = 0;

See also

Using CToolBarCtrl