ASPxClientCallback = _aspxCreateClass(ASPxClientControl, {
 constructor: function(name) {
  this.constructor.prototype.constructor.call(this, name);
  this.CallbackComplete = new ASPxClientEvent();  
 },
 SendCallback: function(parameter) {  
  this.PerformCallback(parameter);
 },
 PerformCallback: function(parameter) {
  if(!_aspxIsExists(parameter)) parameter = "";
  this.CreateCallback(parameter);
 },
 OnCallback: function(result) {
  var args = new ASPxClientCallbackCompleteEventArgs(result.parameter, result.data);
  this.CallbackComplete.FireEvent(this, args);
 }
});
ASPxClientCallback.Cast = ASPxClientControl.Cast;
ASPxClientCallbackCompleteEventArgs = _aspxCreateClass(ASPxClientEventArgs, { 
 constructor: function(parameter, result){
  this.constructor.prototype.constructor.call(this);  
  this.parameter = parameter;   
  this.result = result;
 }
});