// The client event ColumnFilterAdded takes two parameters sender and e
// sender is the object which is raising the event
// e is the ColumnFilterAddedArgs
function WDG1_ColumnFilterAdded(sender, e) {
//Gets the column filter object that need sto be added
var filter = e.get_columnFilter();
//Gets the key of the column that the column filter is tied to
var columnKey = filter.get_columnKey();
//Rule and value based filtering condition that will apply to the ControlDataField which the ColumnFilter is tied to.
var condition = filter.get_condition();
//Gets the rule applied on the filter
var rule = condition.get_rule();
window.status = "Filtering is done on the column '" + columnKey + "'";
}