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Silverlight BusyIndicator Disabling Content

I am using the busy indicator from the Silverlight toolkit. I bind the IsBusy property to a property in my viewmodel to disable content and display it with BusyIndicator. I also use the Prism RegionManager TabControlRegionAdapter to enter views in the tabcontrol.

This usually works fine, but I noticed a strange error. In a script, I disabled content for one view, switched to another tab, threw an event using eventAggregator, which sets the first IsBusy view to false in its viewModel, and then switches back to the first tab. If I do this, the BusyIndicator will disappear, but the content is still disabled.

Thoughts?

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Set the property Canvas.ZIndexfor BusyIndicator. I set mine to 1 and it seems to solve these problems if I use RadBusyIndicator, but the same principles can play.

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