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    <p>WPF binding errors aren't always the easiest thing to read, but break it up by the colons/semi-colons/periods, and read it backwards:</p> <ul> <li>target property is 'NoTarget' (type 'Object')</li> <li>target element is 'ContentControl' (Name='HeaderBorder');</li> <li>DataItem='FrameViewModel' (HashCode=55649279); </li> <li>BindingExpression:Path=Active; </li> <li>'Active' property not found on 'object' ''FrameViewModel' (HashCode=55649279)'. </li> <li>BindingExpression path error: </li> <li>System.Windows.Data Error: 40 : </li> </ul> <p>This can be read as:</p> <ul> <li>Somewhere you are trying to bind a property called <code>NoTarget</code></li> <li>This property is located on a <code>&lt;ContentControl&gt;</code> with <code>Name="HeaderBorder"</code></li> <li>The DataItem (<code>DataContext</code>) behind that UI object is of type <code>FrameViewModel</code></li> <li>The property you are trying to bind is called <code>"Active"</code></li> <li>The <code>Active</code> property is not found on <code>FrameViewModel</code></li> <li>The rest of the stuff is usually ignorable</li> </ul> <p>Normally I'd suggest you look in your code for something that looks a bit like this:</p> <pre><code>&lt;ContentControl Name="HeaderBorder" NoTarget="{Binding Active}" /&gt; </code></pre> <p>and that will be where your problem is for this error message</p> <p>But, in your case the problem property is <code>NoTarget</code>, which is apparently something special to WPF (I learn something new all the time!) related to the triggers. </p> <p>A Google quick search returns <a href="https://stackoverflow.com/q/53301/302677">this post</a>, which suggests the problem is caused by not using the correct syntax for binding to an attached property. </p> <p>Try writing the binding for your attached property with parenthesis, like this</p> <pre><code>&lt;DataTrigger Binding="{Binding Path=(local:Card.Active),... </code></pre> <p>(I'm not entirely sure if this will work because I thought attached dependency properties had to be attached to UI objects, and you have yours attached to a <code>Card</code> object which sounds like a data object. But I could be wrong, or have misunderstood your code :))</p>
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    1. COHi Rachel, Thanks for your response. I have seen your answers for a couple of other similar errors and those helped in reading the error. If you see the last block of code posted above you will find the ContentControl with the Header Border `<ContentControl Template="{DynamicResource FrameHeader}" Grid.Row="0" x:Name="HeaderBorder" >` But there is no property `NoTarget`. That is part of the error. `FrameViewModel` is in fact the DataContext but the Active property is defined in the class Card instead, as shown in the code above. Any suggestions on how to resolve this?
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    2. CO@user3137730 Sorry, I realized that `NoTarget` means something special in WPF (no property targetted) and just finished updating my answer. Does the updated answer help?
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    3. COI tried using the parenthesis both with and without the Card class but both approaches don't resolve the error. Using card with the property I get a compile time error that _Card is not supported in a Windows Presentation Foundation (WPF) project._ and trying to run the project causes error in merging resource dictionaries. Not using card gives the same binding error for `(Active)`. You are right that `Card` is a data object. I think you've got the hang of my code right. Only problem now is to find the problem ;)
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