title: to fetch a particular record
body: <p>m writing the front end of my application using EXTJS.I have a grid say grid 1, and another grid say grid 2.i select a particular row from grid 1 and the items related to the selected row appear in my grid 2. if a user changes any item in grid 2 both the grids have to be refreshed.after reloading them i am not able to retain the selected row of grid 1. but i have a variable which stores a particular column value of the selected row. is there any way i can get my complete record on the basis of this column value. </p>