Astah User's Guide
Select the Statemachine Diagram in the Structure Tree, then check off the [Frame Visibility] in the Propety view.
This is the tool palatte of Statemachine Diagram, for all the common tools, check out here.
Select [Initial Pseudo State] from the Tool palatte and click on a diagram.
There are three ways to create States.
By default, States won't appear on the Structure Tree. So in order to show them, you need to change the setting in the System properties.
You can insert a new State between existing ones that are connected by Transition line.
To add an region, choose [Add Region] from State's pop-up menu and choose vertical or horizontal.