Could you please elaborate a little bit more on your scenario:
1) Do you want to have a BusyIndicator around the whole tileView or just in some of the items?
2) Why the tileState change could take a long time - are you loading data on it or you just have a heavy control(chartView, gridView) inside the tile?
3) Are you using animations, fluidContentControls or something else?
I've attached two simple project that show two approaches - busyIndicator using PreviewTilesStateChanged and TilesAnimationCompleted and busyIndicator with char and fluidContentControl so could you please examine them and see they help you.
We're looking forward to hearing from you again.
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