I know the tutorial you send me, but this work in case of selecting packages or diagrams because it is available only in case of using Extension menu, but this menu 'Extension Menu' can be not displayed if you right click on class diagram for example.
Any way the point here is to simplify the process at end-user. to be more precise, for example if I add a TV for each class then the user comes to type the value of that Tag, but he could provide wrong entries ex: if here type 0 instead of 1, then all of the plug-in functionality would be wrong, that why I offer if we could add some drop down menu by somehow for each component / element and then the error rate will be 0, because of
no manual data to enter.I am still thinking of that, because it is very important, I need more automated and precising mechanism....
once again thank you Geert Bellekens a lot. but still need more suggestions ..

Regards,