How to grab a webpage with an open drop-down menu?

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http://askubuntu.com – I'm trying to show a bug in a website that causes a drop-down box to be populated with too few options. I can show the source, but I'd rather grab the screen with the menu "open", i.e. with the available options showing. I tried two options, both fail: grab screen with keyboard shortcut (shortcut doesn't work when box is open) grab screen with time delay, open the box during the delay (the image grabbed shows the box closed) Is the second feature, actually a bug? I was using gnome-screenshot, perhaps something else will work? BTW, there seems to be another bug with gnome-screenshot: whe (HowTos)