When will Sencha & HTML5 be ready for trre grids with lockable columns?

[Tink]

Title is self explanatory (if I could spell tree).

Been able to do this for years in Flex. There lots of request for this in Sencha, yet no action. Can someone come out with an ETA for tree based grid with locked columns, or at least point us to the core issue, with i presume is in Table.js somewhere?

[evant]

http://cdn.sencha.com/ext/beta/4.2.0...-treegrid.html