In a web WebHierarchicalDataGrid using a DatePickerProvider for cell editing.
When there are 2 or more bands expanded in firefox and you try and edit the cell the DatePickerProvider renders much further down the grid then the currently select cell.
This happens in both Version=17.2.20172.1006 and Version=17.2.20172.1006, only in FF, renders fine in Chrome
I investigated the issue you are mentioning and I was able to reproduce it with version 17.2 build 1006.After further investigation I was able to confirm that this issue is fixed in the latest versions of the ASP.NET product (18.2 and 19.1).I am strongly suggesting you to update your product to the latest version were the issue is resolved.
Let me know if I may be of any further assistance.