FIXED : RMB menus on viewer windows.

Noticed an issue in the latest exp build, if you open a CHOP viewer through the Window COMP and have that CHOP recook every frame, the RMB menu in the CHOP Viewer (the one that was opened from the COMP Window, node->viewer seems to work) vanishes as soon as its opened. Ran into similar problems with DAT Viewers from Window COMPs

will be fixed in the next build. thank you.

Selina