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/command/ContentCommand.java
while ( e != null )
			{
				
				
				if ( slot.findPosn( e ) >= newPosn )
					return false;
				e = e.getExtendsElement( );
			}
		}
		return true;
	}
	/**
	 * Returns true if content in component slot of report design has
	 * descendants, otherwise false.
	 * 
	 * @param content
	 *            the content to handle
	 * @param fromSlotID
	 *            the slot that contains the element
	 * @return true if content has descendants, otherwise false.
	 */
	private boolean hasDescendents( DesignElement content, int fromSlotID )
	{
		return element instanceof ReportDesign
				&& fromSlotID == ReportDesign.COMPONENT_SLOT
				&& content.hasDerived( );
	}
	/**
	 * Does some transformation between template elements and report items or
	 * data sets. Virtually all elements must reside in a container. Containers