Bug 152560 PDF doesn't display bottom Border in inner group footer properly
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/PDFTableLM.java
while(removedIter.hasNext( ))
			{
				DropCellInfo cell = (DropCellInfo)removedIter.next( );
				cell.cell.setHeight( cell.cell.getHeight( ) + maxHeight - cell.leftHeight );
			}
			currentBP += maxHeight;
		}
	}
	private int createDropID( int groupIndex, String dropType )
	{
		int dropId = -10 * ( groupIndex + 1 );
		if ( "all".equals( dropType ) ) 
		{
			dropId--;
		}
		return dropId;
	}
	/**
	 * start cell update content cache
	 * 
	 * @param cell
	 */
	public void startCell( ICellContent cell )
	{
		int groupLevel = getGroupLevel( );
		int rowSpan = cell.getRowSpan( );
		if ( groupLevel >= 0 )
		{
			CellDesign cellDesign = (CellDesign) cell.getGenerateBy( );
			if ( cellDesign != null )