set back checkbox value

Hi everbody.

I use this:

var obj = new AW.UI.Grid;
...
obj.setCellTemplate(new AW.Templates.Checkbox, 0);
...
obj.onCellValueChanged = function(value, column, row){
   ...
}

When somebody change the checkbox value I save it in a database with AW.HTTP.Request. If there is some problem I have to change back the chackbox value, but this fires the

obj.onCellValueChanged = function(value, column, row){
   ...
}

function again, so this is a vicious circle.
Can anybody give me an idea hove to manage this?


PS. excuse my English