Bug 88878 [Preferences] File and Content Type pages should link to one another
There should be some mention of the relationship between content type and file association pages.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/ContentTypesPreferencePage.java
public Object[] getElements(Object inputElement) {
            return getChildren(null);
        }
        /*
         * (non-Javadoc)
         * 
         * @see org.eclipse.jface.viewers.IContentProvider#dispose()
         */
        public void dispose() {
        }
        /*
         * (non-Javadoc)
         * 
         * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer,
         *      java.lang.Object, java.lang.Object)
         */
        public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
            manager = (IContentTypeManager) newInput;
        }
    }
    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.jface.preference.PreferencePage#createContents(org.eclipse.swt.widgets.Composite)
     */
    protected Control createContents(Composite parent) {
        Composite composite = new Composite(parent, SWT.NONE);
        composite.setFont(parent.getFont());
        GridLayout layout = new GridLayout(2, false);
        layout.marginHeight = layout.marginWidth = 0;