different measurement units. </LI>
<LI>
RulerGridControl to draw a grid on the main view to which the user may snap the mouse.</LI>
<LI>
RulerGuideControl to allow the user to manage guidelines.</LI>
<LI>
RulerShowControl to show or hide rulers. Because hidden rulers are set not usable, and thus do not work well with GCN, applications including a RulerShowControl need to do some extra work. This is not difficult, but exactly what needs to be done may vary between applications. For details, see <A HREF="#Rul