2.5.1 focus problem with IE - script debugger says undefined

running latest 2.5.1 eval version with IE 7. Still having problem with one of my grid instances that does not take focus when i click on a cell. works fine on firefox. I install the Microsoft script debugger and it gives this error:

A Runtime error has occurred. Line 21
Error: 'undefined' is null or not an object

the code within the 2 ** are the offending code reported by the debugger.

...FocusIn":"focus"};AW.dispatch=function(element,event){var type="_on"+(events[event.type] || event.type)+"Event";var target=AW.object(element.id);var obj=target;while(obj._parent){obj=obj._parent}
**return target[type].call(obj,event)**
};AW.camelCase=function(){var i,s=arguments[0];for(i=1;i<arguments

any idea what is the problem? my code was fine on AW version 2.
thanks

Can you post an example of your grid?! So we can test and try to find it out.
Tkz.