[NTG-context] grid and \definelayout

Hi, I tried to enable the grid with the \definelayout command. This seems to be not possible and can only be done with the \setuplayout command. The reason is that I set up the layout in one of my modules with a own setup command and the current setup option is choosen by a keyword, e.g. \setupmymodule[firstpage][..,..=..,..] creates \definelayout[firstpage] with the comma seperated list between the second brackets. Is it there something build in that im unable to find and if not is it possible to include this, because I try to avoid adding another option that is neccessary to enable/disable the grid. Wolfgang