A couple of extension writing questions

[Neil Bird <gnome fnxweb com>]

  I'm just putting the final touches to a GNOME Shell extension I've 
been writing, and I'd like to ask if anyone has any idea how to achieve 
some things I've not been able to find out for myself.


- I'd like to use a custom icon.  At the moment, I'm using a text label. 
 I did manage to load a PNG as an icon, but couldn't figure out how to 
size it correctly (it's 16px high but not square), and with no supplied 
size info. it appeared too low (with its top aligned to the text's 
bottom), making the whole top panel taller.  Plus, by default it 
wouldn't highlight on hover.  Do I need to get clever with some CSS and 
background settings?

  I also couldn't figure out where to put custom SVGs, I can only make 
extensions use system-installed /usr/share/... files. 
/usr/local/share/../ & ~/.local/share/... didn't work (although neither 
of these is practical for a stand-alone extension).  In fact, even a 
standard one didn't work (accessories-text-editor-symbolic.svg), I just 
got a grey rectangle [although that was the only standard one that failed].


- I'd also like to style some tooltips (to be left aligned), but I 
couldn't find a way to refer to them from the stylesheet, nor to apply 
style classes to them from code.  Is that possible?


  For ref. I'm on Fedora 16 & GNOME 3.2.

--
[phoenix@fnx ~]# rm -f .signature
[phoenix@fnx ~]# ls -l .signature
ls: .signature: No such file or directory
[phoenix@fnx ~]# exit