Is there plans to provide the ability to disable the button that is added to the navigation bar when the navigation page is a part of the MasterDetailPage? I looked at doing it by overriding the renderer for Navigation page but couldn't get it to work just right. I think I could make it happen if UpdateLeftBarButtonItem was protected virtual so I could override and make it act the way I want it to if there is no plans to give us the ability to disable the button built in.
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