How was this Eclipse view made?

I'm looking in developing a plugin For Eclipse that will add a new context menu and when clicked a dialog will pop up and users will be able to select from a list of thing to install. I would like my dialog to have the same look and feel of the attached screen shoot (from eclipse when you edit a new plugin). So my question is: Any idea how this interface was made? It is HTML and if so how can this be done? Or are this custom Swing controls, or something like this? I'm new to Java so i might not ask the question properly, but any help would be appreciated. Thanks.