could not capture down arrow in combobox in wpf

Question

I have a combobox on a window in wpf and i am trying to capture the down arrow key of this combobox but i am not able to do so. The following is the only code i have for the combobox.

<ComboBox Height="23" HorizontalAlignment="Left" Margin="10,10,0,0" Name="comboBox1" VerticalAlignment="Top" Width="120"
              PreviewKeyDown="comboBox1_PreviewKeyDown" KeyDown="comboBox1_KeyDown" IsEditable="True"/>

C#

private void comboBox1_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Down)
            MessageBox.Show("hi");
    }

    private void comboBox1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Down)
            MessageBox.Show("hi");
    }

The event is not even hit when i press down arrow key.

Answer 1

Try handling PreviewKeyUp (or KeyUp) instead. If that does not work, then there must be more to your window or code (are you handling other instances of these events)?