Setting the value of a textfield inside dataTable

Hi All
I have a dataTable which contains one textField and a commandLink in each row.When the commandLink is clicked a popup containing list of values is opened.When the user selects a value from that popup I have to set it to the adjacent textfield.
This behaviour is working fine outside the table.What am doing is finding the adjacent textfield by client id and calling
textField..getValueBinding("value").setValue(context,value)
But inside the table the following exception is thrown.
Caused by: javax.faces.el.PropertyNotFoundException: Base is null: mem
     at org.apache.myfaces.el.ValueBindingImpl.resolveToBaseAndProperty(ValueBindingImpl.java:463)
     at org.apache.myfaces.el.ValueBindingImpl.setValue(ValueBindingImpl.java:251)
     at ....
Whats the ideal way to tackle this issue ?
Please Advice.
Thanks
Balu

Thanks for your reply...
My bean is in session scope.But the issue is , when i call the inputField.getValueBinding("value") for a component inside table, the binding obtained is that of the request scope variable var.
When i calls the valueBinnding.setValue(context,"value") this attribute is not available.
i think my approach is not correct...
Please advice
Thanks
Balu

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