Is there any event fired by the WinTabbedMdi so that I can rename the tab?
Like Excel, you can right-click on the tab and the 'rename' menu item.
It would be nice to have some keyboard shortcut as well, e.g., F2 when selecting a Tab.
You would need to execute custom code to rename the tab when the F2 key is pressed. Also, the tabs do not support in-place renaming, so you would need to show a text box near the tab or in a modal dialog where the user can rename the tab. You can also submit feature requests for the tabbed mdi manager to do these things here: http://devcenter.infragistics.com/Protected/RequestFeature.aspx.