A simple problem, can't seem to find the solution

[Vhati]

I'm trying to add a CommandBarComboBox to a custom command bar, and the command bar adds and populates fine, however i can't get it to fire its change event

'cbrCmdBar is my command bar
'commandbareventclass handles all the command bar events
Dim cBarCombo As CommandBarComboBox
Set cBarCombo = cbrCmdBar.Controls.Add(msoControlDropdown)
Set CommandBarEventClass.cBarBoxNavigation = cBarCombo
 
'CommandBarEventClass code is below
 
Public WithEvents cBarBoxNavigation As CommandBarComboBox
 
 
Public Sub cBarBoxNavigation_Change(ByVal Ctrl As Office.CommandBarComboBox)
     msgBox "event fired"
End Sub

the event is not fired on teh change. I've used the same method to make command bar buttons and they work fine...so whats the deal with the combo box?? any help would be great, thanks