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How to make a ListBox focusable?

Posted By:      Posted Date: October 12, 2010    Points: 0   Category :WPF

I have some F1 help stuff and need a particular listbox to be focusable, so that when the user hits F1 on the listbox, the correct help topic comes up.  Everything is fine except I can't seem to make the listbox focusable.  I tried in the XAML Focusable=true, but that doesn't seem to work.  When i use Snoop, I can click "Focusable" in snoop and then it works.  What is going on?  All of my textboxes, buttons etc work fine.  Also, on one other control the F1 doesn't work if I have a PreviewKeyDown event.  When i get rid of that, it works also?

<StackPanel Grid.Column="1">
<StackPanel Orientation="Vertical">
<Label Content="Regions" Style="{StaticResource SubLabel}"
Width="75" HorizontalContentAlignment="Left" Margin="0,0,350,0"/>
<ListBox Name="RegionsLB" Height="150" Width="425" ItemsSource="{Binding Path=Regions}"
help:Help.Topic="Primary_Panel\Primary Region Display.htm" Focusable="True" >

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