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Have a RibbonBar button with the __ECTN_TBB_SEPARATED_DROPDOWN style.

I see how to fill its menu at design time.

Cant see how to catch the click on the button to runtime fill the popup menu.

For example, Ribbonbar combox have: OnPopupListBoxInitContent to fill at run time.

The question relates to How to dynamically update the contents of the menu activated from the drop-down button built in a toolbar/menu?. You place a marker (or kind of stand-in) into the pop-up menu at design-time. At runtime, when the menu is about to pop-up, you replace this marker with real menu items.

Yea, but this popup was created from a ribbon bar node. Like below
    pRibbonGroupEntry->ModifyFlags( __ECTN_TBB_SEPARATED_DROPDOWN );

So, I can’t do what you say.

As I said for example, Ribbon Bar combos are caught as follows:
bool CMyRibbonBar::OnPopupListBoxInitContent(
    CExtBarButton * pTBB,
    CExtCustomizeCmdTreeNode * pNode,
    CListBox & wndListBox
    )
This is different from the normal way of catching combos.

I don’t see anything like this for RibbonBar menus
So the problem is I dont know when the menu is about to popup.

In your code you create some pRibbonGroupNode command button node which is configured as a drop-down button. Create only one child (CExtCustomizeCmdTreeNide) in the pRibbonGroupNode node. The child node should have some known ID_MARKER command identifier. Add a CExtPopupMenuWnd::g_nMsgPrepareOneMenuLevel handler to your main frame class. The method will be invoked by any Prof-UIS popup menu immediately before it appears on the screen. In this method, make a search for the ID_MARKER command item. If the item is found, remove it and add a set of other menu items instead of removed item. Here is how the code may look:

// Method declaration:
LRESULT OnExtMenuPrepareLevel( WPARAM wParam, LPARAM lParam );

// Message map entry:
ON_REGISTERED_MESSAGE( CExtPopupMenuWnd::g_nMsgPrepareOneMenuLevel, OnExtMenuPrepareLevel )

// Implementation template:
LRESULT CMainFrame::OnExtMenuPrepareLevel( WPARAM wParam, LPARAM lParam )
{
      lParam;
CExtPopupMenuWnd::MsgPrepareMenuData_t * pData =
            reinterpret_cast
            < CExtPopupMenuWnd::MsgPrepareMenuData_t * >
            ( wParam );
      ASSERT( pData != NULL );
CExtPopupMenuWnd * pPopup = pData->m_pPopup;
      ASSERT( pPopup != NULL );
CExtPopupMenuWnd * pPopupParent = pPopup->GetParentMenuWnd();
INT nItemPos = pPopup->ItemFindPosForCmdID(ID_MARKER );
      if( nItemPos >= 0 )
      {
            pPopup->ItemRemove( nItemPos );

            // TO DO: insert other menu items into pPopup sub menu here

      } // if( nItemPos > 0 )
      return 1;