Is it possible to use arrow keys alone to expand tree node in package explorer in Eclipse on Linux?

Question

When using Eclipse I browse through the package explorer tree using the keyboard arrows a lot.

In Windows I can expand a collapsed node by pressing the →<

Answer 1

The answer provided by Andrew is correct. Please note that in newer versions of Ubuntu there is no ~/.gtkrc-2.0 file, so you can either create it or you can edit the gtkrc of your current theme, which is stored in

/usr/share/themes/your_theme/gtk-2.0/gtkrc