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copied!<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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