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POComboBox with Checkboxes closes on Checkbox Click
 

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    <p>I have <a href="https://stackoverflow.com/questions/6503022/wpf-combobox-with-checkbox-selecteditem">this</a> same problem, but the solution presented isn't working, nor is any other I've found. I want to create a <code>ComboBox</code> with <code>CheckBox</code>es as part of the <code>ItemTemplate</code>. This has been accomplished. But the problem arises when the user clicks a <code>CheckBox</code>: the <code>PopUp</code> closes. I need it to stay open.</p> <p>I tried handling the <code>ComboBox.SelectionChanged</code> event and the <code>CheckBox.Click</code> event, but I can't get it. From tracing through the code, it appears that the SelectionChanged event doesn't fire at all when the user clicks the <code>CheckBox</code>, which is matches the behavior of the control as nothing appears in the <code>TextBox</code> portion.</p> <p>This is not for multiple selection, but rather to have the <code>CheckBox</code> bind to a property in the data context.</p> <p>Here is some sample code</p> <pre><code>&lt;Toolbar VerticalAlignment="Top"&gt; &lt;ComboBox x:Name="comboBox" SelectionChanged="ComboBox_SelectionChanged"&gt; &lt;ComboBox.ItemTemplate&gt; &lt;DataTemplate DataType="local:MyType"&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="Auto"/&gt; &lt;ColumnDefinition/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;CheckBox Click="CheckBox_Clicked"/&gt; &lt;TextBlock Text="{Binding Title}" Grid.Column="1"/&gt; &lt;/Grid&gt; &lt;/DataTemplate&gt; &lt;/ComboBox.ItemTemplate&gt; &lt;local:MyType Title="item 1"/&gt; &lt;local:MyType Title="item 2"/&gt; &lt;local:MyType Title="item 3"/&gt; &lt;local:MyType Title="item 4"/&gt; &lt;/ComboBox&gt; &lt;/Toolbar&gt; private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e) { // do some stuff } private void CheckBox_Clicked(object sender, RoutedEventArgs e) { // change a property on the data context if not data bound // Tried this, but Popup just closes then reopens comboBox.IsDropDownOpen = true; // This seems to have no effect e.Handled = true; } </code></pre> <p>Can anyone help?</p> <p><strong>EDIT:</strong></p> <p>I noticed that there is a difference of behavior when the <code>ComboBox</code> is placed in a <code>Toolbar</code>. When not in the <code>Toolbar</code>, it behaves as expected: the <code>CheckBox</code> changes state without closing the <code>Popup</code>. But in the <code>ToolBar</code>, the <code>Popup</code> closes on the first click, regardless of where the click is. Try the new code, please. I really need this in a toolbar.</p> <p><strong>EDIT 2:</strong></p> <p>For posterity and anyone searching for it, <a href="http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/859bae90-2f92-42dc-af79-46b9193f0dd2" rel="nofollow noreferrer">MS suggested</a> setting the Focusable property of the CheckBox in the DataTemplate to false. This achieves the desired effect.</p>
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    1. COYou should not have CheckBoxes in a ComboBox in the first place.
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    2. COI agree with @H.B. a combobox shouldn't be multi-selectable. The reason is that there is then no standard way to close the combobox i.e. you have to find a different place to click to close it. Much better to have an expandable element of some sort to contain a simple listbox.
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    3. COI've copied your solution to the blank wpf project, but I can't reproduce your problem: the popup remains open when I click checkboxes. It becames closed only if I click somewhere outside the combobox.
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