Bug 120918 Usability: Tabs above and below Layout Editor are confusing
In BIRT 2.0 (I'm using M3), the Layout Editor has tabs above and below the editor window to give the developer different views. Top: Normal, Master Page, Source Bottom: Layout, Preview, Script What is not clear initially from the UI is that the bottom choices are only available with the "Normal" top choice. In addition, the "Source" label is not clear -- implication is that this is (programatic) source code. The Usability team should look at this to determine what improvements could be made, but a suggestion would be to flatten this into a top set of tabs only: Report Layout, Master Page, Script, XML Report Design, Preview
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
slotID = getDefaultSlotID( parent );
		}
		return slotID;
	}
	/**
	 * Find the position of the element. If the element is null, the position is
	 * last
	 * 
	 * @param parent
	 * @param element
	 * @return position
	 */
	public static int findInsertPosition( DesignElementHandle parent,
			DesignElementHandle element )
	{
		
		if ( element == null )
		{
			SlotHandle slotHandle = parent.getSlot( DEUtil.getDefaultSlotID( parent ) );
			if ( slotHandle != null )
			{
				return slotHandle.getCount( );
			}
			return -1;
		}
		return DEUtil.findPos( parent, element.getContainerSlotHandle( )
				.getSlotID( ), element );
	}
	/**
	 * Map GUI defined property key to DE defined property key