I found an easy way to quickly convert a grouped vector drawing to black & white. Simply clone your group and drag the black colour to it from the colourline. Now just apply a saturation transparency to your clone and Voila! You can adjust the greys by using alt +click to select the original group and clone again now apply a brightness transparency to this clone now by adjusting the transparency slider you can adjust the brightness of the greys. Still though not a true convert to greyscale (hint hint Xara!)
Edit: This can now be done in the same way using the enhance transparency in XP&GD6 andXDP6. Once the enhance transparency has been applied you can use the photo tools to adjust saturation, brightness and contrast.
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