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Sidebar throws console errors when disposed

The Sidebar appearing on the nested page seems not being correctly disposed and throws many console errors when the browser window is resized. This only happens if the Sidebar is of type

"SidebarType.Auto" and has a "MediaQuery" attribute.

I attach your own generated sample with these modifications. To reproduce the bug follow these steps:

1) Run the sample

2) Open the browser's console (F12)

3) Navigate to the Sidebar sample page

4) Navigate to the main page or back (so the Sidebar's page get disposed)

5) Resize the browser's window

Multiple errors appear every time you resize the window, and it happens worse if you visit the Sidebar page again and go away, then the error is twice and so on...

It seems that some part of the code is trying to access the disposed Sidebars forever.