How to know which item is currently selected in the Combo Box drop-down menu

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How to know which item is currently selected in the Combo Box Popup. So that the Combo Box can be updated while the navigation happens inside the Popup.

Note: Need to update it though the Combo Box's popup is still open. Like the below image,


Try set IsEditable to Truefor ComboBox like this:

<ComboBox IsEditable="True"
          IsReadOnly="True"
          SelectedIndex="0">

    <ComboBoxItem>1</ComboBoxItem>
    <ComboBoxItem>2</ComboBoxItem>
    <ComboBoxItem>3</ComboBoxItem>
</ComboBox>