Hi,
Supposing you have the data in your datagrid also serverside in a database or so, it's easier to use a library as phpexcel for this. I have very good results with it and also can take care of styling the excel file with this.
This is no a problem... I use phpexcel too...
My requeste is an idea to have this functionality in the framework.. Nothing more..
If the team developers don't want it, I continue to use the phpexcel class...