Wicket DropDownChoice Advice

Yes, I admit it, the DropDownChoice is tough! 
After spending way too many hours on it, I have the following advice.  If you are trying to bind the value of your dropdownchoice to anything besides a String, that's fine and dandy, but don't try to have the DropDownChoice bind DIRECTLY to your value.  For example, if you have a Double, Long, whatever, you should set it yourself.  How do you do this?  By having the DropDownChoice bind to some pojo, and you use that pojo value to set your Double/Long/Whatever.
My case was that I wanted to populate a DropDownChoice of possible Mile Radius (i.e. 1 Mile, 10 Miles, etc) and the value would be a double (i.e. 1.0D, 10.0D)   Could not get this to happen.  Finally, I just created a pojo called SelectedDistance with 2 properties.  This was undated fine by the DropDownChoice.  I just updated my Double property to the value of my SelectedDistanced distance value.
Code is here:
http://stitches.googlecode.com/svn/trunk/stitches-client/src/java/org/au...