gtk bug?

[Martin Oberzalek <oberzalek chello at>]

I created 2 simple windows. On one window there are some 
pushbuttons and there I choosed the "pressed" signal.

Now when I press the button, the signal arrives.
When I click on the other window, this window doesn't react, but
the "pressed" signal arrives a second time. 
After clicking a second time on the window, the window reacts.

I solved this problem with using the "clicked" signal instead of the
"pressed" signal.

Is this a known bug?
-- 
The linux is with me.