PS Just wanted to add that I haven't found neither any events to do this nor properties. But, if there were a property to autosize the wrapper control to the ASP.NET control it accomodates, as the hosted ASP.NET control changes its size, it would make the wrapper more useful? Because then people could use controls like RadDateTimePicker, that may change their size during their usage, in the same way they can use them without a wrapper? Or maybe there is such a property or a combination of properties?