Bug 122850 Table/list should not be able to be inserted in Master Page mode.
Description: Table/list should not be able to be inserted in Master Page mode. Steps to reproduce: 1. New a report and transfer to Master Page mode. 2. New a datasource and dataset 3. Drag a list/table to page header/footer, bind it to dataset and drag some columns inside. 4. Save and preview Expected result: Insert list/table item in master page should be forbidden. Actual result: They are allowed and preview showed "undefine" in page
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
return "library"; 
		if ( getContainer( ) == null )
			return getDefn( ).getName( ); 
		ContainerSlot slot = getContainer( ).getSlot( getContainerSlot( ) );
		ISlotDefn slotDefn = getContainer( ).getDefn( ).getSlot(
				getContainerSlot( ) );
		StringBuffer sb = new StringBuffer( );
		sb.append( getContainer( ).getIdentifier( ) );
		sb.append( "." ); 
		sb.append( slotDefn.getDisplayName( ) );
		sb.append( "[" ); 
		sb.append( slot.findPosn( this ) );
		sb.append( "]" ); 
		return sb.toString( );
	}
	/**
	 * Sets the element with the id reference.
	 * <p>
	 * Part of: Inheritance system.
	 * 
	 * @param baseId
	 *            The id reference element.
	 */
	public void setBaseId( long baseId )
	{
		this.baseId = baseId;
	}
	/**
	 * @return Returns the idRef.
	 */