Bug 5571 JAR Packager: Reveal first checked project
If the list of projects in the JAR Packager is long it is possible that the shown projects are not checked even though there are checked projects (due to current selection). ==> reveal the first checked project.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/jarpackager/JarPackageWizardPage.java
SIZING_SELECTION_WIDGET_WIDTH,
					SIZING_SELECTION_WIDGET_HEIGHT);
		fInputGroup.addTreeFilter(new EmptyInnerPackageFilter());
		fInputGroup.addTreeFilter(new ContainerFilter(ContainerFilter.FILTER_NON_CONTAINERS));
		fInputGroup.addTreeFilter(new LibraryFilter());
		fInputGroup.addListFilter(new ContainerFilter(ContainerFilter.FILTER_CONTAINERS));
		fInputGroup.getTree().addListener(SWT.MouseUp, this);
		fInputGroup.getTable().addListener(SWT.MouseUp, this);
	}
	/**
	 * Creates the export type controls.
	 *
	 * @param parent the parent control
	 */
	protected void createExportTypeGroup(Composite parent) {		
		Composite optionsGroup= new Composite(parent, SWT.NONE);
		GridLayout optionsLayout= new GridLayout();
		optionsLayout.marginHeight= 0;
		optionsGroup.setLayout(optionsLayout);
		fExportClassFilesCheckbox= new Button(optionsGroup, SWT.CHECK | SWT.LEFT);
		fExportClassFilesCheckbox.setText(JarPackagerMessages.getString("JarPackageWizardPage.exportClassFiles.text")); 
		fExportClassFilesCheckbox.addListener(SWT.Selection, this);
		fExportJavaFilesCheckbox= new Button(optionsGroup, SWT.CHECK | SWT.LEFT);
		fExportJavaFilesCheckbox.setText(JarPackagerMessages.getString("JarPackageWizardPage.exportJavaFiles.text")); 
		fExportJavaFilesCheckbox.addListener(SWT.Selection, this);
	}
	/**
	 * Updates the enablements of this page's controls. Subclasses may extend.
	 */
	protected void updateWidgetEnablements() {