Customize TFS workitem screen

This is related to TFS2010 I have the following requirment:

Multiple tasks can be associated with a user story when a user story is closed using the VSTS UI, I need to check if all the associated tasks are closed as w开发者_如何学编程ell.

My Question:

Is it possible to bind a validation function to workitem UI?

will witadmin be of use in this case?

witadmin is used to administer your work item templates, not for editing them.

Your requirement cannot be fulfilled with a simple work item template. I think you have to create a query to select all tasks that are not closed but have a closed user story.

Another way is to create a TFS addon. A similar task has beed described here.