I have a COM based addon toolbar for Outlook. In outlook2007 when resized the outlook window such that some of the addon toolbar controls hide in chevron(drop-down menu of toolbar) and for _CommandBarComboBox when select or change text of combbox and hit enter from that drop-down menu of toolbar, It is not firing change events. However buttons are firing events correctly.I have created this combobox using Office::_CommandBarComboBox and use IDispEventSimpleImpl for adding change events.Please help, is there any flags or style type i am missing or any other.