Bug 178519 Problems in multi-rows header
Please see the attachments.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/cache/TableAreaLayout.java
* @return
	 */
	private IStyle getColumnStyle( int columnID )
	{
		
		return null;
	}
	
	
	
	
	
	protected void verticalAlign( CellArea c )
	{
		CellArea cell;
		if(c instanceof DummyCell)
		{
			cell = ((DummyCell)c).getCell( );
		}
		else
		{
			cell = c;
		}
		IContent content = cell.getContent( );
		if ( content == null )
		{
			return;
		}
		CSSValue verticalAlign = content.getComputedStyle( ).getProperty( IStyle.STYLE_VERTICAL_ALIGN );
		if ( IStyle.BOTTOM_VALUE.equals( verticalAlign )