Bug 11437 jar packager: no error message but buttons disabled
20020314 on the 'jar manifest' wizard page, if you select to use existing manifest file there's no error message but next and finish are disabled user should be informed what to do to make the wizard happy
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/jarpackager/JarManifestWizardPage.java
* @param parent the parent control
	 */
	protected void createSealJarGroup(Composite sealGroup) {
		fSealJarRadioButton= new Button(sealGroup, SWT.RADIO);
		fSealJarRadioButton.setText(JarPackagerMessages.getString("JarManifestWizardPage.sealJar.text")); 
		fSealJarRadioButton.addListener(SWT.Selection, fUntypedListener);
		fSealJarLabel= new Label(sealGroup, SWT.RIGHT);
		fSealJarLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL));
		fSealJarLabel.setText(""); 
		
		fUnSealedPackagesDetailsButton= new Button(sealGroup, SWT.PUSH);
		fUnSealedPackagesDetailsButton.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
		fUnSealedPackagesDetailsButton.setText(JarPackagerMessages.getString("JarManifestWizardPage.unsealPackagesButton.text")); 
		fUnSealedPackagesDetailsButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				handleUnSealPackagesDetailsButtonPressed();
			}
		});
		
	}
	/**
	 * Creates the JAR sealing specification controls to seal packages.
	 *
	 * @param parent the parent control
	 */
	protected void createSealPackagesGroup(Composite sealGroup) {
		fSealPackagesRadioButton= new Button(sealGroup, SWT.RADIO);
		fSealPackagesRadioButton.setText(JarPackagerMessages.getString("JarManifestWizardPage.sealPackagesButton.text")); 
		fSealPackagesLabel= new Label(sealGroup, SWT.RIGHT);
		fSealPackagesLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL));