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    copied!<p>The issue seems to be <a href="http://www.simple-talk.com/dotnet/.net-framework/data-and-silverlight-2-data-binding/" rel="nofollow noreferrer">Rule #1 from this post</a>:</p> <blockquote> <p>The target of data binding must be a FrameworkElement.</p> </blockquote> <p>So since ScaleTransform isn't a FrameworkElement it doesn't support binding. I tried to bind to a SolidColorBrush to test this out and got the same error as with the ScaleTransform. </p> <p>So in order to get around this you can create a control that exposes a dependency property of your tag data type. Then have a property changed event that binds the properties of your tag data to the properties in the control (one of which would be the scale transform). Here is the code I used to test this out.</p> <p>items control:</p> <pre><code>&lt;ItemsControl x:Name="items"&gt; &lt;ItemsControl.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;local:TagControl TagData="{Binding}" /&gt; &lt;/DataTemplate&gt; &lt;/ItemsControl.ItemTemplate&gt; &lt;/ItemsControl&gt; </code></pre> <p>tag control xaml:</p> <pre><code>&lt;UserControl x:Class="SilverlightTesting.TagControl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" &gt; &lt;TextBlock x:Name="text" TextWrapping="Wrap" FontSize="18" Margin="4,4,4,4"&gt; &lt;TextBlock.RenderTransform&gt; &lt;ScaleTransform x:Name="scaleTx" /&gt; &lt;/TextBlock.RenderTransform&gt; &lt;/TextBlock&gt; &lt;/UserControl&gt; </code></pre> <p>tag control code:</p> <pre><code>public partial class TagControl : UserControl { public TagControl() { InitializeComponent(); } public Tag TagData { get { return (Tag)GetValue(TagDataProperty); } set { SetValue(TagDataProperty, value); } } // Using a DependencyProperty as the backing store for TagData. This enables animation, styling, binding, etc... public static readonly DependencyProperty TagDataProperty = DependencyProperty.Register("TagData", typeof(Tag), typeof(TagControl), new PropertyMetadata(new PropertyChangedCallback(TagControl.OnTagDataPropertyChanged))); public static void OnTagDataPropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e) { var tc = obj as TagControl; if (tc != null) tc.UpdateTagData(); } public void UpdateTagData() { text.Text = TagData.Title; scaleTx.ScaleX = scaleTx.ScaleY = TagData.Weight; this.InvalidateMeasure(); } } </code></pre> <p>Seems like overkill for just setting a single property, but I couldn't find an easier way. </p>
 

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