Please, note, that your question is not directly related to RadSplitter but to general ASP and CSS knowledge. To make a DIV element scrollable, you should make sure that it fulfils the following:
- has explicit size in pixels set
- has overflow auto.
On a side note, you can also achieve the same by nesting another splitter in the RadPane instead of DIVs and set the header with explicit size and the second pane with Scrolling="Both".
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