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
*	Answer the contents of the destination specification widget. If this
	 *	value does not have the required suffix then add it first.
	 *
	 *	@return java.lang.String
	 */
	protected String getDestinationValue() {
		String requiredSuffix= getOutputSuffix();
		String destinationText= fDestinationNamesCombo.getText().trim();
		if (!destinationText.toLowerCase().endsWith(requiredSuffix.toLowerCase()))
			destinationText += requiredSuffix;
	return destinationText;
	}
	/**
	 *	Answer the string to display in self as the destination type
	 *
	 *	@return java.lang.String
	 */
	protected String getDestinationLabel() {
		return JarPackagerMessages.getString("JarPackageWizardPage.destination.label"); 
	}
	/**
	 *	Answer the suffix that files exported from this wizard must have.
	 *	If this suffix is a file extension (which is typically the case)
	 *	then it must include the leading period character.
	 *
	 *	@return java.lang.String
	 */
	protected String getOutputSuffix() {
		return "." + JarPackage.EXTENSION; 
	}