Working with the Telerik RadSplitter control I had the situation where I had dynamic controls in a panel inside a RadSplitter. If you are using any sort of tree control or expanding panel you will find the RadSplitter is only resized to the size of the contents when the page first loads and if you change the height of the content you get scroll bars. I have searched for a solution and all information from Telerik indicate this is by design and the control doesn't support this type of behaviour. But it is possible, if you look at the online help you will see they use the splitter control with this exact behaviour. Find a page with a little bit on content and expand the tree menu. You will find the height of the RadSplitter control is increased and no scroll bars appear. So how come it works here?