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/api/core/INameManager.java
/**
	 * Gets the host module of this name manager. The host module is what adapts
	 * all the managements for element names to assure that all the child
	 * elements have a unqiue name.
	 * 
	 * @return the host module of this name manager
	 */
	Module getHostModule( );
	/**
	 * Makes a unqiue name for the given element.
	 * 
	 * @param element
	 *            the element to make a unique name
	 */
	void makeUniqueName( DesignElement element );
	/**
	 * Clears the data in name manage and re-initialize it.
	 * 
	 */
	void clear( );
	/**
	 * Deletes the element from the name manager.
	 * 
	 * @param element
	 *            the element to drop
	 */
	
	void dropElement( DesignElement element );
}