Hello Ron Frick,
The transition control is a content control by default. Most of the primitives that are using in the RadDocking are items controls.(RadSplitContainer,RadPaneGroup ...) There is no way to replace the ItemsControl with ContentControl(RadTransitionControl). The only possible place to put a radtransition is in the TabControl template. See the blog post
for further reference.
All the best,
the Telerik team
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