yesterday I have updated xtherion a little bit. "Edit->Hide inactive scraps" should work now as well as right clicking on point or line invokes context menu. 

If you have some idea, what else should go to context menu or how items there should be arranged, please let me know.

For windows users: I have upgraded bundled TclTk to 8.6 (in fact, only 8.5 features were needed), but I had to compile it my self. I hope, there will be no major issues.

Regards, S.