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    <p>I suspect that since instances of <code>DependencyPropertyDescriptor</code> are likely to be cached at application level, the references to ValueChanged delegate (the anonymous delegate in <code>OnInitialized</code> method) might leak instances of the <code>BindableRichTextBox</code>. </p> <p>In the code shown there isn't, indeed, any call to <code>DependencyPropertyDescriptor.RemoveValueChanged</code> to remove the handler. </p> <p>You might consider using the <code>DependencyProperty.Register</code> overload, which supports a <code>PropertyMetadata</code> parameter; this allows you to specify a proper PropertyChangedCallback for the property (see <a href="http://msdn.microsoft.com/en-us/library/cc903933(v=VS.95).aspx#metadata" rel="nofollow">http://msdn.microsoft.com/en-us/library/cc903933(v=VS.95).aspx#metadata</a>):</p> <pre><code>public static readonly DependencyProperty DocumentProperty = DependencyProperty.Register("Document", typeof(FlowDocument), typeof(BindableRichTextBox), new PropertyMetadata(null, new PropertyChangedCallback(OnDocumentChanged) ) ); public static void OnDocumentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { ((BindableRichTextBox)d).SetBaseDocument((FlowDocument)e.NewValue); } public new FlowDocument Document { get { return (FlowDocument)GetValue(DocumentProperty); } set { SetValue(DocumentProperty, value); } } private SetBaseDocument(FlowDocument document) { base.Document = (FlowDocument)GetValue(DocumentProperty); } </code></pre>
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    1. USMarco Amendola
    1. USMarco Amendola
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    1. COHello Mr. Amendola. Firt thank for you answer and advices. I am quite newbie in WPF world, this is my seconds WPF application I still learing ;). I am little confuse. Because I don’t know where is it good place in BindableRichTextBox class to use DependencyPropertyDescriptor.RemoveValueChanged.
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    2. COThat was the point: there's no good point (as far I know) to ensure that RemoveValueChanged is always called; for this reason I prefer to use PropertyMetadata to specify a PropertyChangedCallback, which is the intended way to deal with dependency property. I'll add a small snippet in my previous reply.
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    3. COThank Mr. Amendola, you have only one mistake, I correct it. base.Document = (FlowDocument)GetValue(DocumentProperty);
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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