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PODebug ElementName binding
 

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    <p>Is there a way to futher debug bindings other than using PresentationTraceSources.TraceLevel?</p> <p>I have a rather complex issue, where an ElementName-binding fails (the element is not found) when it is used on a CommandParameter on a Button that is a child on UserControl2 which is placed inside UserControl1. The output of PresentationTraceSources.TraceLevel=High is (PåstandsListe is UserControl2):</p> <pre><code>System.Windows.Data Warning: 52 : Created BindingExpression (hash=8957325) for Binding (hash=61342683) System.Windows.Data Warning: 54 : Path: 'SelectedItem' System.Windows.Data Warning: 56 : BindingExpression (hash=8957325): Default mode resolved to OneWay System.Windows.Data Warning: 57 : BindingExpression (hash=8957325): Default update trigger resolved to PropertyChanged System.Windows.Data Warning: 58 : BindingExpression (hash=8957325): Attach to System.Windows.Controls.Button.CommandParameter (hash=426476) System.Windows.Data Warning: 63 : BindingExpression (hash=8957325): Resolving source System.Windows.Data Warning: 66 : BindingExpression (hash=8957325): Found data context element: &lt;null&gt; (OK) System.Windows.Data Warning: 70 : Lookup name PåstandsListe: queried Button (hash=426476) System.Windows.Data Warning: 61 : BindingExpression (hash=8957325): Resolve source deferred 'Domstolene.JFS.GUI.vshost.exe' (Managed (v2.0.50727)): Loaded 'C:\Windows\assembly\GAC_64\System.Transactions\2.0.0.0__b77a5c561934e089\System.Transactions.dll', Symbols loaded. System.Windows.Data Warning: 63 : BindingExpression (hash=8957325): Resolving source System.Windows.Data Warning: 66 : BindingExpression (hash=8957325): Found data context element: &lt;null&gt; (OK) System.Windows.Data Warning: 70 : Lookup name PåstandsListe: queried Button (hash=426476) System.Windows.Data Warning: 63 : BindingExpression (hash=8957325): Resolving source System.Windows.Data Warning: 66 : BindingExpression (hash=8957325): Found data context element: &lt;null&gt; (OK) System.Windows.Data Warning: 70 : Lookup name PåstandsListe: queried Button (hash=426476) System.Windows.Data Warning: 63 : BindingExpression (hash=8957325): Resolving source System.Windows.Data Warning: 66 : BindingExpression (hash=8957325): Found data context element: &lt;null&gt; (OK) System.Windows.Data Warning: 70 : Lookup name PåstandsListe: queried Button (hash=426476) System.Windows.Data Warning: 63 : BindingExpression (hash=8957325): Resolving source System.Windows.Data Warning: 66 : BindingExpression (hash=8957325): Found data context element: &lt;null&gt; (OK) System.Windows.Data Warning: 70 : Lookup name PåstandsListe: queried Button (hash=426476) System.Windows.Data Warning: 63 : BindingExpression (hash=8957325): Resolving source System.Windows.Data Warning: 66 : BindingExpression (hash=8957325): Found data context element: &lt;null&gt; (OK) System.Windows.Data Warning: 70 : Lookup name PåstandsListe: queried Button (hash=426476) System.Windows.Data Warning: 63 : BindingExpression (hash=8957325): Resolving source System.Windows.Data Warning: 66 : BindingExpression (hash=8957325): Found data context element: &lt;null&gt; (OK) System.Windows.Data Warning: 70 : Lookup name PåstandsListe: queried Button (hash=426476) System.Windows.Data Warning: 63 : BindingExpression (hash=8957325): Resolving source (last chance) System.Windows.Data Warning: 66 : BindingExpression (hash=8957325): Found data context element: &lt;null&gt; (OK) System.Windows.Data Warning: 70 : Lookup name PåstandsListe: queried Button (hash=426476) System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=PåstandsListe'. BindingExpression:Path=SelectedItem; DataItem=null; target element is 'Button' (Name=''); target property is 'CommandParameter' (type 'Object') </code></pre> <p>Changes without any effect:</p> <ul> <li>Binding to the parent element of UserControl2 instead of UserControl2.</li> </ul> <p>Non-failing scenarios (here the ElementName-binding works):</p> <ul> <li>UserControl2 is not placed within UserControl1.</li> <li>Button is added as a child to UserControl1 instead of UserControl2.</li> </ul> <p>Futhermore when I attach Snoop to the application the ElementName-binding starts working when I select the Button within Snoop (but no information is displayed in the VS Output window). Does Snoop somehow refresh the binding?</p> <h2>Update</h2> <p>It seems the problem only occurs when the Button is not initially visible, e.g. placed in an Expander og TabItem which are not visible.</p>
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