Hi!
My organization uses EXT.NET version 2.0 and my chief does not want to update to a newer version.
So as a C# developer, I have some problem in implementation some tasks.

For example, how to inplement in EXT.NET version 2.0 this:
https://examples2.ext.net/#/GridPane...group_headers/
I need to add a summary line with the sums in all columns.
http://prntscr.com/dv6e1b

Thanks in advance for your reply