Is there any update on lockable columns Grid in gxt 3???
I'm still using GXT 2 so no update from me - if you are a paying user send an email to Sencha to request lockable columns get added to the library! Requesting it may help convince Sencha that it's a useful feature.
It wasn't too hard to get the basic two grids synchronised - there are just some quicks to workaround. Give it a go and post back here - I and others can probably help with any issues.