switching windows while in drag&drop

[Gregory Kovriga <gkovriga techunix technion ac il>]

Hi,
I have a question regarding "Alt+TAB" switching windows while in 
drag&drop: it doesn't seem to work (gnome 2.8, metacity), forcing to use 
the taskbar or placing the windows in a manner that will not obscure the 
target while taking the object from the source.
Being able to switch between windows with keyboard while holding 
drag&drop objects would relieve a lot of pain...

Is it a GTK / Metacity / XDND limitation? What exactly is the reason for it?

Thanks,
Gregory.