Checkbox doesn't "refresh" when datacontext changed?

07-02-2009 1:31 PM |

I have a checkbox on a navigation page that I have bound to a field in the datacontext.  I modify one textbox and one checkbox control.  When I press a button, I go to WCF and get new data and then replace the datacontext of the page.  The textbox text changes, but the checkbox ischecked property remains whatever it was before I pressed the button.  Is IsChecked NOT the thing to bind to the data?

Oh, the field that is being bound to the checkbox is a nullable boolean (if that makes any difference).  The textbox that works is bound to a nullable string.