title: Force CascadingDropDown to refresh without page reload
body: <p>How do I force a <code>CascadingDropDown</code> to refresh it's data without a page refresh? I have a button on the page which adds a variable to the Session which is then used to set the selected value of all the drop downs. However I can't seem to force the refresh of a DropDownList without a full refresh of the page.</p>