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I was getting this error when trying to bind to one my control's properties:

Error 149 Two-way binding is only supported for properties. 'PropertyName'
is not a valid property on "filename to control" xxx

The solution (though not very understandable from the error) was to convert
the property type (in this case an integer) to a string. Just thought
others would benefit by this little piece of info.

Thanks,

Matt