title: Custom Argument for a build definition
body: <p>Is it possible to modify the xaml for a build definition's workflow to have a custom argument that is not dependent on a custom assembly. <a href="http://www.ewaldhofman.nl/post/2010/05/17/Customize-Team-Build-2010-e28093-Part-6-Use-custom-type-for-an-argument.aspx" rel="nofollow">This tutorial</a> shows how to create a custom argument but its in an the given assembly. I have build definitions that are shared and don't want to have the baggage of an assembly. </p>
  
  <p>So basically I just want a custom argument in which I can supply some options for in the xaml and then when configuring the build definition in the ui you would be pressented with a drop box of these defined options.</p>
  
  <p>Is this at all possible?</p>