To provide users with the ability to navigate, select, and interact with popup data in a MultiColumn ComboBox using keyboard shortcuts for improved accessibility. Keyboards Actions : Enter- Select the focused item and close the popup. Esc- Close the popup. Alt + Down Arrow- Open the popup. Alt + Up Arrow- Close the popup. Up Arrow- Select the previous item. Down Arrow- Select the next item. Home- Select the first item. End- Select the last item. Tab- Select the focused item, close the popup, and move to the next focusable element. Shift + Tab- Select the focused item, close the popup, and move to the previous focusable element.