plugin for IBM EWM-7.0.2 [verify naming convention for a new tream]

hi, i would like to develop a plugin for ewm 7.02 (eclipse, no web) that allows me to verify if the name i give to a stream follows a specific naming convention. i have followed the RTC700ExtPoT.pdf workshop, set up the environment to create a plugin, and set up the target machine with the server-side sdk, but i am still having some difficulties. i can't figure out how to verify the name of the stream when i press the save button on the create new stream screen. i'm trying to proceed by simple steps, i'd like to at least display a prompt on the console “ok - pressed save button” when i press the save button on the create new stream window. Verifying the name of the stream will be pretty simple for me. of course after the writing on the console the stream must still be saved.

any help would be really appreciated