Binding the IsEnabled property to whether a text block has data

Programmer Question

I'm using silverlight for windows phone and I want to bind the IsEnabled property of a button to whether a textblock has text in it or not. In other words, I want my button to be enabled when the textblock's Text is not empty and disabled otherwise.

Is it possible to do this purely in XAML using Styles/Setters/Triggers or any other mechanism or do I have to write a converter?

PS: I'm still learning silverlight, .NET etc ..

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