Fernando, if you are using the Eclipse 3.1 Release you should add Java in the perspective settings. When you install JBoss Ide the installation instructions indicates that you should select the JBoss Ide perpective, just click on the Java check box also.
That made it for me.
And by the way... I'm Costa Rica.
Correction to my past message... I'm Costa Rican ... hahaha forgot the n.
I have the same problem as Fernando, and have tried fabio_quimbay's solution but alas, it still doesn't show the XDoclet Configuration in the properties of my Project.
sorry guys, It did work, the oscar show had half my attention, thanx ...