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    copied!<p>Modify <code>getGridData</code> to return <code>List&lt;Dictionary&lt;string, object&gt;&gt;</code> and ensure the numeric values are added the dictionary using a numeric type such as <code>int</code> or <code>double</code>.</p> <p><strong>Edit</strong></p> <p>It may be easier to use a concrete example, here is some test code:-</p> <pre><code>public partial class BubbleTest : UserControl { public BubbleTest() { InitializeComponent(); Loaded += new RoutedEventHandler(BubbleTest_Loaded); } void BubbleTest_Loaded(object sender, RoutedEventArgs e) { var s1 = new BubbleSeries(); s1.DependentValueBinding = new Binding("[dependent]"); s1.SizeValueBinding = new Binding("[size]"); s1.IndependentValueBinding = new Binding("[independent]"); s1.ItemsSource = GetGridData(); s1.Title = "Chart"; ChartVis.Series.Add(s1); } private List&lt;Dictionary&lt;string, object&gt;&gt; GetGridData() { List&lt;Dictionary&lt;string, object&gt;&gt; gridData = new List&lt;Dictionary&lt;string, object&gt;&gt;(); gridData.Add(CreateBubbleEntry("First", 10.0, 5.0)); gridData.Add(CreateBubbleEntry("Second", 20.0, 10.0)); return gridData; } private Dictionary&lt;string, object&gt; CreateBubbleEntry(string independent, double dependent, double size) { var item = new Dictionary&lt;string, object&gt;(); item.Add("independent", independent); item.Add("dependent", dependent); item.Add("size", size); return item; } } </code></pre> <p>The Xaml for this user control is as you have it:-</p> <pre><code>&lt;UserControl x:Class="SilverlightApplication1.BubbleTest" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:toolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit" &gt; &lt;Grid x:Name="LayoutRoot" Background="White"&gt; &lt;toolkit:Chart Title="Visaulization" Grid.Column="0" x:Name="ChartVis"&gt; &lt;toolkit:Chart.Series&gt; &lt;/toolkit:Chart.Series&gt; &lt;/toolkit:Chart&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre> <p>The above works so whatever you are actually doing will vary in some way.</p>
 

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