I'm trying to implement a dialog using the Ext.ux.grid.GroupSummary class, but allowing the grouping to be turned on/off by the end user, and am running into issue doing so.

As a test case, i'm using the most recent demo from the Sencha site, and commenting out the following lines in totals.js

//enableNoGroups: false,
//enableGroupingMenu: false,
When unchecking, and then re-checking the "Show in Groups" menu option in the column header, the following error is thrown:

s is undefined
Line 180
in addition to that, the column header widths collapse as well. is this a known issue (and hence the reason this feature was turned off in the demo).

thanks for the help.