my tiny little gtk
::: god, this will never end; it's just unbelievable why GTK has to refresh the whole underlying
widget (mainly the whole application area) when you want to refresh a GtkImage. i used GtkFixed 
and other 'wizard' stuff but after the long run decided to access directly GdkDrawable and draw
that way. it's working... why others not: don't ask, but i have some ideas.