I am trying to change the orientation of the SplitPane after the DockManager has rendered but nothing changes. It seems like the parameter is not reactive.
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ADMIN EDIT
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A possible option for the time being is to dispose and reinitialize the DockManager when you want to change the SplitPane Orientation.
Here is a runnable sample: https://blazorrepl.telerik.com/QfYHboFl280vuIkL03.