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
*/
	protected Label createLabel(Composite parent, String text, boolean bold) {
		Label label= new Label(parent, SWT.NONE);
		if (bold)
			label.setFont(JFaceResources.getBannerFont());
		label.setText(text);
		GridData data= new GridData();
		data.verticalAlignment= GridData.FILL;
		data.horizontalAlignment= GridData.FILL;
		label.setLayoutData(data);
		return label;
	}
	/**
	 * Sets the size of a control.
	 *
	 * @param control the control for which to set the size
	 * @param width the new  width of the control
	 * @param height the new height of the control
	 */
	protected void setSize(Control control, int width, int height) {
		GridData gd= new GridData(GridData.END);
		gd.widthHint= width ;
		gd.heightHint= height;
		control.setLayoutData(gd);
	}
	/**
	 * Makes the size of all buttons equal.
	 */
	protected void setEqualButtonSizes() {
		int width= SWTUtil.getButtonWidthHint(fManifestFileBrowseButton);