By right clicking on a node a context menu can be opened. When selecting "Icons" a submenu is shown. If the node is in the upper part of the screen, part of the icon list is clipped by the screen boundaries. The icon menu should be displayed in multiple columns if necessary or at a lower position.
Java(TM) SE Runtime Environment (build 1.7.0-b147)
There already is bug(s) report for that.