I have a scenario with a panel (100% width/height) which contains a splitter with two vertical panes. These panes have a CSS class applied including borders. When the panel is updated via ajax, I notice the bottom and right borders of the left pane dissapear. I am guessing the splitter needs to recalculate its size based on the update panel being added through the ajax update. I handle the splitter OnClientLoad and "jiggle" the left pane by adding 1 to its width and subtracting 1 from its width and then doing the same for its height, and this seems to take care of the issue. I am wondering if there is a different method of making sure the splitter panes resize properly after an ajax update inserts the update panel around the splitter, or if Telerik is planning on modifying the splitter at some point in the future so that I don't need to include this OnClientLoad script with every splitter that may be inside an ajaxified container.