Xaml BottomAppBar AppBarButton and GridView inter-binding

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I am trying to bind the BottomAppBar AppBarButton Visibility to a selection state of the GridView on a xaml page. Like this: ""

used converter checks SeletedIndex value if it's "< 0" the button Visibility is Collapsed, otherwise it's Visible. The idea is - no selection, no command available.

It does not work, the converter is never triggered, no error on compilation, nor on run. What could be the solutions of this problem. Thanks in advance for any tip.

asked 1 min ago

AlexCH

1

Xaml BottomAppBar AppBarButton and GridView inter-binding