User-agent: Mozilla Thunderbird 1.0.6 (Windows/20050716)
on further thought, i realized that there's another option. GEF could
provide a ShowPalettAction and HidePaletteAction combo. the actions
would be enabled in "expert" mode, and would cause the palette to flyout
and collapse respectively. in "beginner mode" the current UI could be used.
it would then be up to the application to decide upon the UI that would
be appropriate to run the actions.
this is not ideal, but might be preferable to having the palette flyout
"tab" always above the vertical scrollbar (which is not the most
intuitive place for it).
it also allows app developers to experiment with the UI to find one
that's intuitive for their users.