[Xmonad] transient windows and tabbed layout

[Geoffrey Alan Washburn]

Is it the intended behavior that when using the tabbed layout transient 
windows will remain even when switching away from the application's 
window?  Or is the problem I am having that my software is not correctly 
hinting its windows?  For example, when I am sending mail in Thunderbird 
it pops up a progress window.  If I switch tabs, the progress window 
remains.  This is not too bad in of itself, but what really annoys me is 
that whenever the progress meter refreshes, it switches me back to the 
Thunderbird tab that opened the progress meter window.