*Fixed the following bugs:
DateTimeInputFor now works also with DateTime?
Now when using the off-line calendar if user inserts manually an hill formatted date, the date reset to a valid date
Removed an error in the client validation of treeview, that prevented client side validation errors to be showed in some cases.
Client-Side template engine
Improved the Value binding of the client-side binding engine that now works not only with simple html elements, but also with server controls
Now items controls allow mulple insert also when they have been rendered through Ajax.
New DropDown helper that supports <optgroup> and individual styling of items