WPF ComboBox, force input to UpperCase

Question

I have an editable WPF ComboBox with TextSearchEnabled. I need to force the user\'s text input to uppercase when they type to filter the ComboBox.

I was thinking of

Answer 1

This works and seems like a reasonable solution:

protected void winSurveyScreen_Loaded(object sender, RoutedEventArgs e)
{
    (comboBox.Template.FindName("PART_EditableTextBox", cbObservation) as TextBox).CharacterCasing = CharacterCasing.Upper;
}

Ensure that the combobox is not collapsed on loaded otherwise the template will not be found.