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POStrange behaviour of Listboxes in WPF
 

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    <p>I have a window with two <code>ListBox</code>es both bound to an <code>XMLDataProvider</code>. The <code>SelectedItem</code> property of <code>Listbox1</code> is two-way-bound to the <code>SelectedItem</code> property of <code>ListBox2</code>. So far so good.</p> <p><code>ListBox2</code> contains a <code>Style</code> <code>Trigger</code> which sets <code>IsSelected</code> to true when the mouse hovers over an item. The corresponding item in <code>ListBox1</code> is selected too because of the two-way binding. The problem arises when I select an item in <code>Listbox1</code> by clicking on it</p> <p>For example when I select "Book 1" in <code>ListBox1</code> then move the mouse over all items in <code>ListBox2</code> the item "Book 1" will no longer be selected when the style trigger fires. As soon as I select an item in <code>Listbox1</code> I can no longer select the corresponding item in <code>Listbox2</code> by moving the mouse over it. However, selecting by mouseclick still works.</p> <p>Can someone explain the behaviour and/or provide a solution?</p> <pre><code>&lt;Window x:Class="Test.sample" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" SizeToContent="WidthAndHeight"&gt; &lt;Window.Resources&gt; &lt;Style TargetType="ListBox"&gt; &lt;Style.Setters&gt; &lt;Setter Property="Width" Value="150"/&gt; &lt;Setter Property="Margin" Value="4"/&gt; &lt;/Style.Setters&gt; &lt;/Style&gt; &lt;!-- define the XML data source as a resource --&gt; &lt;XmlDataProvider x:Key="TestData" XPath="/Books"&gt; &lt;x:XData&gt; &lt;Books xmlns=""&gt; &lt;Book&gt; &lt;Title&gt;Book 1&lt;/Title&gt; &lt;Author&gt;Mister 1&lt;/Author&gt; &lt;/Book&gt; &lt;Book&gt; &lt;Title&gt;Book 2&lt;/Title&gt; &lt;Author&gt;Mister 2&lt;/Author&gt; &lt;/Book&gt; &lt;Book&gt; &lt;Title&gt;Book 3&lt;/Title&gt; &lt;Author&gt;Mister 3&lt;/Author&gt; &lt;/Book&gt; &lt;Book&gt; &lt;Title&gt;Book 4&lt;/Title&gt; &lt;Author&gt;Mister 4&lt;/Author&gt; &lt;/Book&gt; &lt;Book&gt; &lt;Title&gt;Book 5&lt;/Title&gt; &lt;Author&gt;Mister 5&lt;/Author&gt; &lt;/Book&gt; &lt;Book&gt; &lt;Title&gt;Book 6&lt;/Title&gt; &lt;Author&gt;Mister 6&lt;/Author&gt; &lt;/Book&gt; &lt;/Books&gt; &lt;/x:XData&gt; &lt;/XmlDataProvider&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;StackPanel&gt; &lt;Label HorizontalContentAlignment="Center"&gt;Listbox 1&lt;/Label&gt; &lt;ListBox x:Name="box1" ItemsSource="{Binding Source={StaticResource TestData}, XPath=Book}" SelectedItem="{Binding ElementName=box2, Path=SelectedItem, Mode=TwoWay}"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;Label Content="{Binding XPath=Title}"/&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; &lt;/StackPanel&gt; &lt;StackPanel&gt; &lt;Label HorizontalContentAlignment="Center"&gt;Listbox 2&lt;/Label&gt; &lt;ListBox x:Name="box2" ItemsSource="{Binding Source={StaticResource TestData}, XPath=Book}"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;Label Content="{Binding XPath=Title}"/&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;ListBox.ItemContainerStyle&gt; &lt;Style TargetType="ListBoxItem"&gt; &lt;Style.Triggers&gt; &lt;Trigger Property="IsMouseOver" Value="True"&gt; &lt;Setter Property="Padding" Value="12"/&gt; &lt;Setter Property="IsSelected" Value="True"/&gt; &lt;/Trigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/ListBox.ItemContainerStyle&gt; &lt;/ListBox&gt; &lt;/StackPanel&gt; &lt;/StackPanel&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre>
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