Hello Viswa,

If you want to use hierarchical data I will suggest using XamContextMenu, you can find description in the documentation:
https://es.infragistics.com/help/wpf/xamcontextmenu-about-xamcontextmenu

Using XamComboEditor with menu is a new product idea, which you can suggest at http://ideas.infragistics.com.

Please note, when submitting your idea this will allow you to communicate directly with our product management team, track the progress of your idea at any time, see how many votes it got, read comments from other developers in the community, and see if someone from the product team has additional questions for you.

Remember when submitting your idea to explain the context in which a feature would be used and why it is needed as well as anything that would prevent you from accomplishing this today. You can even add screenshots to build a stronger case. Remember that for your suggestion to be successful, you need other members of the community to vote for it.  You can also link back to this thread for additional details.