Grid filter

In case of dynamic loading, when  i call this mygrid.filterBy(4,“Incomplete”);
its making the ajax request to load the xml,is there any way to avoid this ajax request

Filtering will not work for dyn. loading modes.
In your situation, after filtering some not loaded area comes to visible part of grid and as result requiest for data loading sent.
You can attache code to onDynXLS event and return false from it to block data loading.