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Ok to answer the two parts of your question: <ol> <li>Why when PageToolBarVisible is fired as "False" at loading the toolbar still shows: Your only hiding the toolbar with the animation in the "ExitActions", which aren't being hit. The logic flows as such. if(PageToolBarVisible == true) Run EnterActions if(PageToolBarVisible changes to false) Run ExitActions if(PageToolBarVisible starts as false) Do nothing if(PageToolBarVisible starts as false and is set to false) Do nothing</li> </ol> Conclusion, because the PageToolBarVisible is not changing from True to False ... the animation doesn't run. Solution: Consider having a second DataTrigger that handles the False case for your PageToolBarVisible property. Or you can set the Property to True and then False to hit your ExitActions (though I'm not sure if this would A) work or B) be a good solution) <ol start="2"> <li>Why setting the backing field for the Property still runs the animation when loaded: I believe what is happening here, is that when the application loads, the Binding is checking the value of the property, if you've set the value of the backing field then it should be getting this from the "Get" on "PageToolBarVisible". So it's not that you're triggering the OnPropertyChanged, it's that the Binding is getting the value when your app is loading</li> </ol> Solution: Either rethink your logic around how your binding to the trigger and thus the animation. Or you can play with the Binding Modes, to be honest I don't think there's a mode that would satisfy the conditions you're looking for, however I might be wrong.
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1. POHow to get View element to fade in/out based on value of ViewModel property?
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1. USChris Nicol
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