Bug Report: Material Panel draw problem

Serengeti (Rhino WIP) Developer
1

Hi - when I open the Materials panel (in the current Rhino6 WIP), and create an Octane Material, I get the following.

after resizing material panel.png496×591 22.4 KB

However when I scroll down with the right hand scrollbar, one of the sub panels is corrupted.

after scrolling the right hand scroll bar.png506×592 18.3 KB

Resizing the Materials panel redraws the panel correctly. This problem does not occur in Rhino5.

Thanks

Paul