I am trying to create a class diagram with jdeveloper but class is grey out

i am trying to create a class diagram with jdeveloper but class is greyed out even though I downloaded the J2EE version
I went through the following steps :
Click the project in which you want to create a new diagram, choose File New from JDeveloper's menu, then select General Diagrams in the left pane of the New dialog.
I have downloaded J2EE Edition Version 10.1.3.1.0.3984

When the class diagram is disabled - does the wizard for creating a new class in the new->General also disabled?
If it is then you are not placing your cursor on the project before you choose file->new
(you are probably on the workspace that contains the project).

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Originally posted by:
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I am trying to create a class diagram with jdeveloper but class is grey out

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