Bug 8476 JAR Packager: Make main class field editable
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/jarpackager/JarManifestWizardPage.java
if (fJarPackage.isManifestGenerated())
			fGenerateManifestRadioButton.setSelection(true);
		else
			fUseManifestRadioButton.setSelection(true);
		fSaveManifestCheckbox.setSelection(fJarPackage.isManifestSaved());
		fReuseManifestCheckbox.setSelection(fJarPackage.isManifestReused());
		fManifestFileText.setText(fJarPackage.getManifestLocation().toString());
		fNewManifestFileText.setText(fJarPackage.getManifestLocation().toString());	
		
		if (fJarPackage.isJarSealed())
			fSealJarRadioButton.setSelection(true);
		else
			fSealPackagesRadioButton.setSelection(true);
		
		
		fMainClassText.setText(fJarPackage.getMainClassName());
	}
	/**
	 *	Initializes the JAR package from last used wizard page values.
	 */
	protected void initializeJarPackage() {
		IDialogSettings settings= getDialogSettings();
		if (settings != null) {
			
			fJarPackage.setGenerateManifest(settings.getBoolean(STORE_GENERATE_MANIFEST));
			fJarPackage.setSaveManifest(settings.getBoolean(STORE_SAVE_MANIFEST));
			fJarPackage.setReuseManifest(settings.getBoolean(STORE_REUSE_MANIFEST));
			String pathStr= settings.get(STORE_MANIFEST_LOCATION);
			if (pathStr == null)