title: GWT Editor use IsEditor<LeafValueEditor<Date>> to populate Long field
body: <p>I just got the hang of using the <code>Editor framework</code> and am porting over all my forms to use it.  I'm running into some trouble on my <code>Event</code> form.  I have 5 different <code>time fields</code> - for each field I use a <code>DateBox</code> to allow the user to select the time.</p>
  
  <p>In my old <code>Activity</code> i converted the values of these fields to <code>Long</code> times, populated my <code>proxy object</code> and persisted it.</p>
  
  <p>I want to do the same thing using the <code>Editor framework</code>.  Is there anyway I can use an <code>Editor</code> with a <code>DateBox</code> to populate a <code>Long</code> field in my domain object.  I'm sure there's got to be a way to do this I'm just having trouble figuring it out.</p>
  
  <p>If this is not the case and I just can't do this for now, does anybody know a good solution for how to do this?</p>