I am using the UltraWinExplorerBar which is wrapped within a UserControl. I have set this UserControl in a new form. I have also set the UseMnemonics on the menu items to 'true'. When I hot key to a menu item the ItemClick event fires twice. I would suspect that this is a bug, since I have reproduced this with a very simple sample project.
Thanks,
Randall Luce
Note that this is a peer-to-peer forum, and is not intended to be used for reporting bugs. I was unable to reproduce the issue you described here with a simple test, so you should report the issue and include the test project with which you are able to reproduce it.