Can the flexbox control be made to 'drop-up' instead of drop-down

Can the flexbox control be made to 'drop-up' instead of drop-down

Hi guys,
    I am using the flexbox control in an application I am developing and was wondering if the flexbox control can be made to 'drop-up' instead of drop-down. My controls are near the bottom of the screen and I would like the list to go up instead of drop-down.
 
thanks in advance
 
Tony