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
WorkbenchHelp.setHelp(composite, IJavaHelpContextIds.JARMANIFEST_WIZARD_PAGE);								
			
	}
	/**
	 *	Create the export options specification widgets.
	 *
	 *	@param parent org.eclipse.swt.widgets.Composite
	 */
	protected void createManifestGroup(Composite parent) {
		fManifestGroup= new Composite(parent, SWT.NONE);
		GridLayout layout= new GridLayout();
		fManifestGroup.setLayout(layout);		
		fManifestGroup.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL));
		fGenerateManifestRadioButton= new Button(fManifestGroup, SWT.RADIO | SWT.LEFT);
		fGenerateManifestRadioButton.setText(JarPackagerMessages.getString("JarManifestWizardPage.genetateManifest.text")); 
		fGenerateManifestRadioButton.addListener(SWT.Selection, fUntypedListener);
			Composite saveOptions= new Composite(fManifestGroup, SWT.NONE);
			GridLayout saveOptionsLayout= new GridLayout();
			saveOptionsLayout.marginWidth= 0;
			saveOptions.setLayout(saveOptionsLayout);
			GridData data= new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL);
			data.horizontalIndent=20;
			saveOptions.setLayoutData(data);
	
			fSaveManifestCheckbox= new Button(saveOptions, SWT.CHECK | SWT.LEFT);
			fSaveManifestCheckbox.setText(JarPackagerMessages.getString("JarManifestWizardPage.saveManifest.text")); 
			fSaveManifestCheckbox.addListener(SWT.MouseUp, fUntypedListener);
	
			fReuseManifestCheckbox= new Button(saveOptions, SWT.CHECK | SWT.LEFT);
			fReuseManifestCheckbox.setText(JarPackagerMessages.getString("JarManifestWizardPage.reuseManifest.text"));