Bug 145520 Group name will not show up in group list if the group use default name and key expression has no value
Description: Group name will not show up in group list if key expression has no value. Steps to reproduce: 1. Insert a table into report, bind it to a data set 2. Switch to property editor -> groups 3. Click on add button to open new group dialog, then press ok button Expected result: A new group with default name will be added to group list Actual result: A new group is added to group list, but without group name. But when let group tab lost focus and get focus again, you can see the group name.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
public static final int PAGE_NAME_SPACE = 5;
	/**
	 * Identifier for the theme name space.
	 */
	public static final int THEME_NAME_SPACE = 6;
	/**
	 * Identifier for the template parameter definition name space.
	 */
	public static final int TEMPLATE_PARAMETER_NAME_SPACE = 7;
	/**
	 * Number of defined name spaces.
	 */
	public static final int NAME_SPACE_COUNT = 8;
	/**
	 * The session that owns this module.
	 */
	protected DesignSession session;
	/**
	 * The number of the next element ID.
	 */
	protected long elementIDCounter = 1;
	/**
	 * The hash map for the id-to-element lookup.
	 */
	protected HashMap idMap = new HashMap( );
	/**
	 * The undo/redo stack for operations on this module.
	 */
	protected ActivityStack activityStack = new ActivityStack( );
	/**