Bug 186940 Style name in theme cannot be identify by auto when reopen the library[01]
Description: Style name in theme cannot be identify by auto when reopen the library[01] Step: 1.Open a library and add a theme 2.New a style on the theme and use the default name that is "NewStyle" 3.Save the library, close it and reopen it again. 4.New another style on the same theme Actual result: The default style name on second times is also "NewStyle" Exception result: The default style name on second times is "NewStyle1"
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/NameCommand.java
* it is not null and it has container. This means that we can modify the
	 * element name as will if it's not attached on other elements, and the name
	 * is saved in name space only after the element is added to a slot of the
	 * container.
	 */
	private void addSymbol( )
	{
		if ( element.getName( ) == null )
			return;
		
		
		if ( !element.isManagedByNameSpace( ) )
			return;
		assert element.getRoot( ) != null;
		
		
		
		
		NameExecutor nameExecutor = new NameExecutor( element );
		INameHelper nameHelper = nameExecutor.getNameHelper( module );
		assert nameHelper != null;
		int ns = ( (ElementDefn) element.getDefn( ) ).getNameSpaceID( );
		DesignElement existedElement = nameHelper.getNameSpace( ns )
				.getElement( element.getName( ) );
		assert existedElement == null;
		getActivityStack( ).execute(
				new NameSpaceRecord( nameHelper, ns, element, true ) );
	}
	/**
	 * Implementation of dropping a symbol from a name space. No need to do the