is the most suitable thread I found for my question.
have a similar issue.
We have a master page with a RadSplitter and in the RadSplitter
we have two RadPanes (TopPane, MainPane). The main pane has again two panes (ToolbarPane
and ContentPane) and inside all panes we have ContentPlaceHolder.
The content itself has JS resize functions which
worked till we updated the ui libs (40.2017.2.503).
Since the update, the panes stay at width 398px and do not resize to the
We tried this: http://www.telerik.com/support/kb/aspnet-ajax/details/initially-resize-the-radsplitter-according-to-its-content
but it did not help.
Has someone an idea?