Change event in a check column

I'm using a checkbox in a column but I need to control the change in this column.

obj.setCellTemplate(new AW.Templates.CheckedItem, 1);

I've tried onCellTextChanged but the event is not executed

obj.onCellTextChanged = function(text, col, row){alert(text);}

I've tried obj.setCellEditable(true);

but no success.

How can I manage this event to execute a ajax command in these conditions?

Thanks in advance.

grid.onCellClicked = function(event,col,row){
if (col==9){
grid.setCellValue(false,10,row)
enablesave();
}
if (col==10){
grid.setCellValue(false,9,row)
enablesave();
}
}