I'm building a prototype with ExtJS 4. The preview was good already and I'm glad to see the Beta 1 is out
I have a question about reconfiguring the grids though. The old api had a reconfigure method, but there doesn't seem to be anything similar on the new API?
I'm basically trying to reconfigure the column model when loading new data.
Similarly, I'm trying to reconfigure the chart series when getting new data.