title: xamDataTree start edit of a node in code
body: <p>I must not be Googling this right.</p>
  
  <p>In an event handler (from a context menu), I want to force an Infragistics xamDataTree into edit mode of a node. As in: right-click, context menu, select Edit, context menu closes and we're in edit mode on the node.</p>
  
  <p>(I know how to do the update, the binding is correct, I have a fully-working dynamically-built context menu, all I need is the "Start Editing This Node" magic).</p>