Your sample did not upload.
Here is a sample that works for me in 3.0.1.0. The 2nd grid changes as you move the current row in the 1st grid, and it seems to work even if you are not changing tables in the 2nd grid on the move.
http://www.syncfusion.com/Support/user/uploads/GDBG_2Grids_e6a9035e.zip
If you still need to send your sample project, you can email it to
[email protected] and mention this forum thread in the subject line.