[NTG-context] float placement

I would like to place a figure (float) on a page by itself, at a specific point. Using \placefigure[force] gives me the figures at that point but not on separate page, whereas \placefigure[page] puts it on a page but not at the point where it should appear. Finally \placefigure[force,page] nor \placefigure[page,force] did help. Howto? Hans van der Meer