Bug 190058 icon for aggregation type data items.
For aggregation type data items in cross tabs, we should show the icon instead of the sigma symbol. I am attaching the icon to replace it
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/figures/TextFlow.java
* Calculates the top coordinate by given container height, text height and
	 * vertical alignment style.
	 * 
	 * @param compHeight
	 *            Container height.
	 * @param textHeight
	 *            text height.
	 * @return
	 */
	protected int calculateTop( int compHeight, int textHeight )
	{
		int rlt = 0;
		if ( verticalAlign.equals( DesignChoiceConstants.VERTICAL_ALIGN_TOP )
				|| verticalAlign
						.equals( DesignChoiceConstants.VERTICAL_ALIGN_BASELINE ) )
		{
			rlt = 0;
		}
		else if ( verticalAlign
				.equals( DesignChoiceConstants.VERTICAL_ALIGN_MIDDLE ) )
		{
			rlt = ( compHeight - textHeight ) / 2;
		}
		else if ( verticalAlign
				.equals( DesignChoiceConstants.VERTICAL_ALIGN_BOTTOM ) )
		{
			rlt = ( compHeight - textHeight );
		}
		return rlt;
	}