Bug 11228 package name shortening pref page - tooltip works as help
tooltip in the pref page where you can specify pattern to shorten package names contains some useful information that should be exposed on the page itself (you can write patterns with numbers!) current behavior is sub-optimal (users must be lucky to find that feature)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/AppearancePreferencePage.java
}	
	/*
	 * @see PreferencePage#createContents(Composite)
	 */
	protected Control createContents(Composite parent) {
		int nColumns= 1;
		
		GridLayout layout= new GridLayout();
		layout.marginHeight= 0;
		layout.marginWidth= 0;
		layout.numColumns= nColumns;
		
		Composite composite= new Composite(parent, SWT.NONE);
		composite.setLayout(layout);
				
		fShowMethodReturnType.doFillIntoGrid(composite, nColumns);
		fShowOverrideIndicator.doFillIntoGrid(composite, nColumns);
			
		initFields();
		
		return composite;
	}
	
	private void doDialogFieldChanged(DialogField field) {
		
		updateStatus(new StatusInfo());
	}
	
	private void updateStatus(IStatus status) {
		setValid(!status.matches(IStatus.ERROR));