[NTG-context] smaller inter line space for headings (on a grid)

Hi all, I have three questions: 1) Is there a convenient way to reduce the inter line space for an head on a grid? First I tried \setuphead[section][style={\ssb\setupinterlinespace[line=1ex]}]—no effect. Finally I defined three commands to get it work. Perhaps someone knows a better way. 2) In a manual I found an example \setuphead[section][grid={line,-5pt}], but it doesn’t seem to work. Is it outdated? Is there an MkIV alternative? 3) Is there a MkIV pendant for \showgridboxes? Thank you in advance Andreas