Hi,

>I would like to create behavour class that react according to certain UI control. For example, if user click on certain button, clicked event fired. Code in my behavour class will be executed.
>
>How to do this?
>
>Beside, I hope to allow developer to specify which control.event to "listen" via property sheet.
>

May be a job for 'Extender Provider' man:
http://msdn2.microsoft.com/en-us/library/ms171836.aspx

HTH,
Viv