Grab the code for the StringToObjectConverter from this blog Yet another blog about IValueConverter.
If you're binding to a model for the other column values, you can create a partial class for the model class you're using. Write a property with just a 'get' that returns the image you want displayed (based, I'm assuming, on the value of another property of that model such as docType). Then you can bind the thumbnail column like you would the other columns.
You'll also need an ImageConverter.
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