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Within Android Lollipop there is a limitation of using Page.IsBusy as Google has stated they no longer support this on Material Design Action Bars:
Because of this, when one tries to use the Page.IsBusy = true, the following is thrown from the console:
06-04 16:27:28.409 E/PhoneWindow(31185): Circular progress bar not located in current window decor
1. Open Attached Sample
2. Run on API 21+ device
3. Notice that the ActivityIndicator does not appear and the console message above is thrown.
*Xamarin Forms Version
XVS - 3.11.586.0
X.A - 18.104.22.168
Call to SetProgressBarIndeterminateVisibility in FormsApplicationActivity.cs contains the breaking change..
fixed in 1.4.4