C# Binary Behaviour in Internet Explorer

Question

I'm trying to implement binary behaviour by using the C# language. I found a great article with a lot of workarounds, So I've implemented my program's behaviour exactly like it was described in the article. But when I run the program, I find that some code isn't executed:

<object id="mybehav" classid="http://localhost:81/mycontrol
/MyControl.dll#MyControl.MyBehaviourFactory"></object>
<style>
   mytag 
     {
       behavior: url(#mybehav); 
     } 
</style>
<mytag id="tag1"></mytag>

Even IElementBehaviorFactory.FindBehavior isn't called. Why could this be the case?