Open Source Document Management

Hi i'm quite new of the project and i don't really know how
to edit a form to make some changes as i like.
I mean for example if i want to modify something to the login form how i have to do?
Is there any graphical IDE that i can use to change it or i have to modify directly
java sources? (LoginPanel.java or something else?)

Thank you
Teo

You have to work in LoginPanel.java, and if you don't want to do this by hand i suggest you to use Eclipse with the GWT plugin.