How to create abstract class in MagicDraw

I'm newbie in MagicDraw and I'd like to know how to specify a class as {abstract}.

I know about de property "Is abstract" in the Specification of Class, but I'd like that it appears in the header.

The place where you set isAbstract in MagicDraw is in the specification window for the class. To open that window, either right-click on the class or press enter while it is selected. The window will look like this:

You didn't specifically ask for more information, but I'll provide it in case you find it helpful.

The model you want to create will look like this:

Notice that Abstract Class is written in italics to indicate it is abstract. Also notice that {complete, disjoint} is specified for the generalization set. (Just FYI, {complete} is also known as a covering axiom.)

Beware that if you do not specify {complete}, you're creating a conflict with the isAbstract meta-property. The reason there's a conflict is that in UML, the default is {incomplete}, which means that you are allowed to create an instance of the super-class without it also being an instance of one of the sub-classes. That conflicts with isAbstract.