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Created attachment 12384 [details]
Demo of the described bug
Programmatically changing the MasterBehavior property of a MasterDetail page under Android has no effect.
See attached project for a demo - I'm expecting the "Change split behavior" button to toggle between the Split and Popover behaviors.
I don't really see how this is an enhancement rather than a bug...
Just took a peek at the MasterDetailPage code for handling a change in MasterBehavior. Literally all it does is enable and disable the ability to change IsPresented:
internal static void UpdateMasterBehavior(MasterDetailPage page)
if (page.MasterBehavior != MasterBehavior.Default)
page.CanChangeIsPresented = false;