I've noticed that after applying the plugin Ext.ux.grid.ColumnHeaderGroup with the plugin Ext.ux.grid.GridFilters and trying to check or uncheck the checkbox filter i get the error: childItem.setChecked is not a function
Actually, as I've noticed from both source code files there are a method handleHdMenuClick in Ext.ux.grid.ColumnHeaderGroup which catches the check event and not the appropriate onCheckChange in Ext.ux.grid.GridFilters.