What is the right way to set a value on the client side, through JavaScript, in the ASP.NET AJAX CascadingDropDown extender?
There is a partial answer at http://stackoverflow.com/questions/116564/how-do-you-reset-asp-net-ajax-cascading-dropdown-control-client-side, but it only involves resetting the controls, not actually setting a value, and I'd like to better understand exactly what the _onParentChanged call is about (since the underscore makes it look like it's not something I should need to call)?