WPF, cannot bind a property because it says it's not a DependencyProperty, but I registered it?

You should change the name of your DependencyProperty to the use the standard convention like PropertyNameProperty instead of naming like a field. When you set something in XAML it calls SetValue and expects the property to be named using the string name ("Template" here) followed by "Property".

Make sure that Template isn't a reserved word that is causing the XAML processor to get confused. Try a different word.

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