I think there may an issue which is concerning with the code. I think you have commented outside to this code:
Code:
DefaultStyleKey = typeof(SimpleButton). And in the Desktop Silverlight
at any rate that line is necessary to connect the control with its default template, which has to be in Themes/generic.xaml. and I do not be acquainted with whether Themes/generic.xaml is carried in Windows Phone 7 or what if any the alternative would be if it is not. And if you are not using the default template then I do not think that you will be going to see anything.
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