"ESRI WebADF CallBack" by greflyhttp://trailfire.com/grefly/trails/59619grefly/trails60AJAX and the ASP.NET 2.0 Callback Frameworkhttp://trailfire.com/grefly/marks/209220ESRI WebADF CallBackgreflyFri, 18 Apr 2008 07:42:39 -0700trailfire:markId:209220__pendingCallbacks[...].async is null or not an objecthttp://trailfire.com/grefly/marks/209249You can get around the error when recursively calling another callback inside a callback handler by delaying the call using window.setTimeout.

example:

BEFORE

function MyCallbackHandler(arg,context) {

 WebForm_DoCallback(......);

}

AFTER

function MyCallbackHandler(arg,context) {

 window.setTimeout("WebForm_DoCallback(......);",0);

}

]]>ESRI WebADF CallBackgreflyFri, 18 Apr 2008 12:29:50 -0700trailfire:markId:209249