Mouse click not fired in some cases in an integration

Hello,

I have a problem I described on this post. The problem is that in certain places the UI does not respond to the mouse click on buttons when opened from within KNIME. Do others observe similar problems? Are there known workarounds? Is there anything special in the non-working codes in your opinion? (Yeah, I have modified a bit the codes to compile and work mostly, but I do not think I could introduce this kind of regression.)
Thanks, gabor