EDIT: In the properties of a grid, there’s an option for using a plug-in.
Is that a holdover from the old Sencha times?
Or is that something for today?
Would be great to see an example of how a [Java?] plug-in does something cool on the grid that’s not normally able to be done.
this is incorrect. I thought I saw something - but I cannot find it now. (Probably shouldn't post on 3-hours sleep, from bed)
Only thing I see about Java plugin is this in a process:

I've never used this - but its prolly discussed in the programmers ref guide.