how to avoid blocking side effect of a menu shell command

[Jenô Balaskó (IJ/ETH)]

Hi all,

could You help me, please.
I should execute a command 'xclearcase' from Shell menu.
I choosed dialog as output.
Unfortunately the control is blocked by this application until
it has been finished. Therefore the editing is stopped.

-The usual umpersand-solution  xclearcase & doesn't work.
-To get back the control by pressing Ctrl-. is not user friendly.
-To open a new window for output instead of dialog is a working solution but
untitled files will opened. 

Is there any fancy solution like '&' to get back the control immediately ? 

Thanks
Attila