How can I make a WPF ContextMenu automatically select the first item when it's opened?

Question

I'm opening a ContextMenu when a user hits a short-cut key (by changing its IsOpen property to true). But when it opens, no item is selected. How can I make the first item be selected, so that the user doesn't have to press the down-arrow to reach it?

Answer 1

Try this:

<ListBox>
    <ListBoxItem Content="Item">
        <ListBoxItem.ContextMenu>
            <ContextMenu Opened="ContextMenu_Opened">
                <MenuItem Click="some_event" Header="Qwerty"/>
            </ContextMenu>
        </ListBoxItem.ContextMenu>
    </ListBoxItem>
</ListBox>

And in code-behind:

private void ContextMenu_Opened(object sender, RoutedEventArgs e)
{
    var contextMenu = sender as ContextMenu;
    (contextMenu.Items[0] as MenuItem).Focus();
}