title: Editing the field definition of a work item type
body: <p>My question is about TFS work items - does the TFS API support editing work item type field definitions?  I need to make what is described in <a href="https://msdn.microsoft.com/en-us/library/ms400654(v=vs.110).aspx" rel="nofollow">this link</a> but using the C# TFS API.</p>
  
  <p>Clarification #1: In the "Bug" work item type I created a definition called "Customer" and added its value items by wizard.  Does the C# TFS API support editing or deleting items in that field?</p>
  
  <p>Clarification #2: I can retrieve that values by using:</p>
  
  <pre><code>AllowedValuesCollection Collec = WorkItemStore.FieldDefinitions["Customer"].AllowedValues;
  </code></pre>
  
  <p>But the allowed values are Readonly without any public setters.</p>