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
{
	/**
	 * Constructs the content command with container element.
	 * 
	 * @param module
	 *            the module
	 * @param container
	 *            the container element
	 */
	public ContentCommand( Module module, DesignElement container )
	{
		super( module, container );
	}
	/**
	 * Adds a new element into a container and specifies the position in the
	 * container. Virtually all elements must reside in a container. Containers
	 * are identified by a container ID. The application creates the element
	 * object, then adds it to the container here. The undo of this operation
	 * effectively deletes the element.