[NTG-context] vertical alignment in footer

Hello: I am a recent convert from LaTeX to conTeXt. kudos to all the developers! I have read through the wiki and as many tutorials/manuals as I can find. My problem is that I have a footer which includes a logo. I would like all the elements in the footer to be vertically centred, where as now they are aligned along the bottom. Here is my code: \startsetups footer \hfill \pagenumber \hfill \llap{\externalfigure[logo]} \stopsetups Thanks, Zoho