By design ASP.NET AJAX Framework cancels the ongoing ajax request if you try to initiate another one prior to receiving the response for the first request. By setting the RequestQueueSize property to a value greater than zero, you are enabling the queuing mechanism of KaxAjax that will allow you to complete the ongoing request and then initiate the pending requests in the control queue.

public int RequestQueueSize { get; set; }

Public Property RequestQueueSize As Integer
	Get
	Set

public:
property int RequestQueueSize {
	int get ();
	void set (int value);
}

member RequestQueueSize : int with get, set