Follow these walkthroughs if you are not familiar with NetBeans or Swing development.If you are already familiar with NetBeans and Swing, you can proceed to the INTViewer Components Walkthroughs.
Adding a window - Steps to add a top component window to INTViewer.
Adding a menu item - Steps to add an entry to an existing menu.
Adding a menu - Steps to add a menu.
Customizing the toolbar - Steps to add and move icons in the toolbar.
Creating a panel - Steps to create a panel
Replacing INTViewer's Help - Steps to replace INTViewer help content with your own
Here are a few more external links to create great-looking GUI with Netbeans