I'd just hook the vwm in to a label and move it around. Say the vwm had a width of 90, with 3 desktops...Have it hooked in to a label with a width of 30. You could then just move the vwm left/right to show what you want, and the rest would be hidden since it's "off screen" in the label. No messy shrinking etc. Then making a button to expand/shrink the label to reveal the whole vwm would be easy enough.