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POStrange focus behavior for simple WPF ItemsControl
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  1. POStrange focus behavior for simple WPF ItemsControl
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    copied!<p>I'm seeing strange behavior when it comes to focus and keyboard navigation. In the example below I have a simple ItemsControl that has been templated so that it presents a list of CheckBoxes bound to the ItemsSource.</p> <pre><code>&lt;ItemsControl FocusManager.IsFocusScope="True" ItemsSource="{Binding ElementName=TheWindow, Path=ListOStrings}"&gt; &lt;ItemsControl.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;CheckBox Content="{Binding}" /&gt; &lt;/DataTemplate&gt; &lt;/ItemsControl.ItemTemplate&gt; &lt;/ItemsControl&gt; </code></pre> <p>For some strange reason the <em>FocusManager.IsFocusScope="True"</em> assignment causes keyboard focus to fail to be set when checking a checkbox via a mouse click and for focus to jump out of the ItemsControl when a check box is checked using the space bar on the keyboard. Both symptoms seem to point to some strange navigation happening when the checkbox is checked but I'm having a hard time getting to the bottom of it.</p> <p>This problem occurs if I set any parent element up the visual tree as a focus scope using this method. If I remove the <em>FocusManager.IsFocusScope="True"</em> then the problems go away. Unfortunately I'm seeing this problem in a larger project where I cannot just remove these focus scopes without worrying about other focus related consequences.</p> <p>Could somebody explain to me the strange behavior I'm seeing? Is this a bug or am I just completely missing something?</p>
 

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