The long awaited stable port to Gtk+-2.x has been released!

midx

主页在http://gtkextra.sourceforge.net/
源码包http://sourceforge.net/project/showfiles.php?group_id=5462

GtkExtra is a useful set of widgets for creating GUI's for the Xwindows system using GTK+. You can use it complementary to GTK+ and it is written in C. It is also Free Software and released under the LGPL license.

期待能解决如附图的问题。
目前gentoo官方还未及将此加入porgate tree。关注。