I was wondering how the default value of an item in a  combBox is set in the
RibbonX world. This used to be ListIndex in the older CommandBar model and I
used to set it to 1 (for example) after doing AddItems.

I used OutlookRibbonXVB_VSTO as a starting point and have the following XML
for the ribbon:
<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui"
 onLoad="Ribbon_OnLoad">
 <ribbon>
   <tabs>
     <tab idMso="TabNewMailMessage">
       <group id="MyWidgetsGroup"
         getVisible="MyWidgetsGroup_GetVisible"
         getLabel="MyWidgetsGroup_GetLabel"
         insertBeforeMso="GroupClipboard" >

           <comboBox
              id="MyCombo"
              label="My Combo"
              onChange ="MyCombo_OnChange"
              getItemCount ="MyCombo_GetItemCount"
              getItemLabel ="MyCombo_GetItemLabel"
             
           />
{etc. for brevity}

The MyCombo_GetItemCount returns 4 and MyCombo_GetItemLabel returns the
strings
"A", "B", "C", and "D" for index values of 0, 1, 2,and  3 respectively.

When I display the new inspector, all the items are there when I pull down
the comboBox but the initial value is blank.

I am missing some connection somewhere between the object model and the XML
and can't seem to figure out the connection.  Or there is a simple callback
somewhere I am missing.

Hope someone can help.