how to change line colors of a boxplot


I searched the forum and the net but I cannot figure out how I can change the line colors for a boxplot (i.e., making all lines black such as medians, whiskers, boxlines, black).

the only thing I accomplished is changing the color of all outliers, e.g., via:

boxplot(X, sym='r+')

Even setting the general line color like

rc('lines', color='k')

doesn't change anything.

Thanks for any help,