setDataProperty - Javascript error

I am getting javascript error while i am using this function with grid object. My code is

obj.setDataProperty("text",function(i,j){return unescape(myGridtempData[i][j])});
obj.setRowCount(dSet.length);
obj.setProperty("selection/index",0);
obj.refresh();

I am loading myGridtempData dynamically. While loading i am getting error "object doesnt support this property or method". Please any one help me.

Which AW version are you using? This code looks like v1.0...

Hi alex..
I dont think it is version problem. Any way i am using 2.0.2 version.
Thanks