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
protected void giveFocusToDestination() {
		fDestinationNamesCombo.setFocus();
	}
	/* 
	 * Overrides method from WizardExportResourcePage
	 */
	protected void setupBasedOnInitialSelections() {
		Iterator enum= fInitialSelection.iterator();
		while (enum.hasNext()) {
			Object selectedElement= enum.next();
			if (selectedElement instanceof ICompilationUnit || selectedElement instanceof IClassFile || selectedElement instanceof IFile)
				fInputGroup.initialCheckListItem(selectedElement);
			else
				fInputGroup.initialCheckTreeItem(selectedElement);
		}
	}
	/* 
	 * Implements method from IJarPackageWizardPage.
	 */
	public void finish() {
		saveWidgetValues();
	}
	/* 
	 * Method declared on IWizardPage.
	 */
	public void setPreviousPage(IWizardPage page) {
		super.setPreviousPage(page);
		if (getControl() != null)
			updatePageCompletion();
	}