Editable DataGrid w/ dependant DropDownList

Ok, so I have an editable datagrid. Two of the columns are in the form of datalists. Both datalists succesffully load and get their correct selectedindex's. This is where I get stuck. The second ddl is dependent upon the selectedindex of the first drop down list. How do I get the values in the second drop down list to change when the selectedindex of the first drop down list has changed? I can easily do this regularly, but I am unsure of how to go about doing it inside an editable datagrid.

Thanks,
Jarrod

 

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