I have reviewed all themes and it seems that in our Windows8Touch theme the LayoutControlSplitter_Foreground resource is missing. Is that the theme that you use in your application?
We will fix the reported issue by removing this setter in the default LayoutControlSplitterStyle as it is not needed. You can meanwhile just add a brush with the same name in the application resources of your project if an exception is thrown locally as I did not manage to reproduce such on my end.
Thank you for your report. Any additional feedback would be appreciated. You can find your Telerik points updated.
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