how to take screen shots in special cases like network icons

[jamesbon]

I have been taking screen shots on ubuntu via the PrintScreen key which still is working.However if I click the network icon in top right hand corner and want to take screen shot of this (with network icon such as available wireless networks in drop down menu) then the print screen key does not work .
Same is the case with volume or battery or bluetooth icon in panel.
If I click on volume icon and there appears a vertical bar to increase or decrease there I pause for a moment I can not take screen shot at that moment.How ever if I again click the volume icon in tray and the vertical bar disappears then I can take the screen shots.So in this situation if I want to take screen shots of the icons then what can I do?

As an example my print screen key will not take a screen shot of following kind

http://www.dedoimedo.com/images/computers/ubuntu-8.10-tp-wireless-1.jpg

Where as I can take a snapshot of this kind
http://www.dedoimedo.com/images/computers/ubuntu-8.10-shutdown-2.jpg

Note in the first link the person was able to take the screen shot of wireless drop down menu which I can not take with my print screen key.

[Krytarik]

Just initiate the screenshot before opening that menu and set a sufficient delay. ;-)

A more feature-rich app is Shutter, of course, if you need something more special:

http://shutter-project.org/

It's in the official repos, but I recommend installing it from its PPA, to always get the most recent version.

Regards.