function RequestStart(sender, args) {
var settings = sender.get_ajaxSettings();
var settingList = '';
for (setting in settings) {
var initControlID = settings[setting].InitControlID;
var updatedControls = settings[setting].UpdatedControls;
var controlList = '';
for (control in updatedControls) {
controlList += ' ' + updatedControls[control].ControlID;
}
settingList += '\nInitiated by: ' + initControlID + '\nUpdated Controls: ' + controlList;
}
alert(settingList);
//...
}