title: "Action State" vs "State" in UML Activity diagram
body: <p>I'm a newbie with UML and Microsoft Visio. <br>
  Today, I have a homework which I need to draw an activity diagram in an UML project. My team use Visio 2003 to draw these diagrams. <br>
  When I open Visio and seek for Activity Diagram I see both Action State and State icon in the left panel, I'm very confused with the difference between them, then I post this question.<br>
  Sorry for my bad English</p>