I know it has been asked before but I can't seem to find an answer.

 I have a User Control that I want to expose an eventhandler as a property.  For example, I want to be able to specify the event handler in markup (<Control Event="control_event">) or by doing it in code behind (ie: UserControl.attributes.add("Event", "control_event")).

 Now that I look at what I want a little further...is this even possible?

Hi,

for the UserControl.attributes.add("Event", "control_event"))  see my blog post:

Mapping of attributes to control properties in ASP.NET - growing to a custom control
http://aspadvice.com/blogs/joteke/archive/2007/08/16/Mapping-of-attributes-to-control-properties-in-ASP.NET.aspx

The mechanism itself works  equally for user control as well as custom controls. You can declare an event which ther control raises in specific circumstances and other controls can listen to that event, and then do what they need to do based on it.