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copied!<p>I wrote some other SO <a href="https://stackoverflow.com/a/14523290/302677">answer</a> recently about how to read the binding errors so they make more sense. To summarize, add line breaks to your error message on the colons and semi-colons, and read it from the bottom up.</p> <p>Your error message is:</p> <ul> <li>System.Windows.Data Error: 40 : <ul> <li>BindingExpression path error: 'ConfigurationModel' property not found on 'object' ''IncrementingTextBox' (Name='video_length_textbox')'. </li> <li>BindingExpression:Path=ConfigurationModel.DontUseSensorLength; </li> </ul></li> <li>DataItem='IncrementingTextBox' (Name='video_length_textbox'); </li> <li>target element is 'IncrementingTextBox' (Name='video_length_textbox'); </li> <li>target property is 'IsEnabled' (type 'Boolean')</li> </ul> <p>This can be read from the bottom up as:</p> <ul> <li><p>The binding failing is the <code>IsEnabled</code> property of an element of type <code>IncrementingTextBox</code> (named video_length_textbox).</p></li> <li><p>The <code>DataItem</code> (<code>DataContext</code>) of the element is an object of type <code>IncrementingTextBox</code> named video_length_textbox</p></li> <li><p>The binding expression it is trying to find is <code>ConfigurationModel.DontUseSensorLength</code></p></li> <li><p>And the problem the binding is having is that the <code>ConfigurationModel</code> property is not found on the data context object <code>IncrementingTextBox</code></p></li> </ul> <p>So your <code>DataContext</code> for "video_length_textbox" is set to itself, and your <code>IncrementingTextBox</code> class does not have a public property called <code>ConfigurationModel</code></p> <p>Since I don't see you setting the <code>DataContext</code> for your <code>IncrementingTextBox</code> anywhere in your XAML, check out the code for your <code>IncrementingTextBox</code> class. The most likely case is you are setting the DataContext to itself in either the Constructor</p> <pre><code>this.DataContext = this; </code></pre> <p>or the XAML</p> <pre><code>DataContext="{Binding RelativeSource={RelativeSource Self}}" </code></pre>

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