Hi Jaypee,
As I understand from your question looks like you want to find a control from your ViewModel, then you can change the dependency property of that control.
You can consider about passing the View as an object to the viewModel as this discussion mentioned:
http://stackoverflow.com/questions/14236222/how-can-i-access-a-control-in-mvvm-model-in-viewmodel, even its talk about WPF, but I have tested with Windows Store App. Should work.
--James
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