Bug 143126 [Regression]Insert chart into table group header, preview, incorrectly.
Insert chart into table group header, preview, incorrectly. Steps: 1.Insert a table 2.Create a group for the table 3.Insert chart into group header, inherit table's data set 4.preivew Actual Results: 1.Chart datas are incorrectly Expected Results: 1.Chart can be previewed correctly.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ColumnBindingDialog.java
private ICellModifier cellModifier = new ICellModifier( ) {
		public boolean canModify( Object element, String property )
		{
			if ( property == null
					|| ( element == dummyChoice && !COLUMN_NAME.equals( property ) ) )
			{
				return false;
			}
			return true;
		}
		public Object getValue( Object element, String property )
		{
			if ( element == dummyChoice )
			{
				ComputedColumn column = StructureFactory.newComputedColumn( inputElement,
						DEFAULT_COLUMN_NAME );
				column.setExpression( "" ); 
				if ( DEUtil.getGroupControlType( inputElement )
						.equals( DEUtil.TYPE_GROUP_GROUP ) )
				{
					column.setAggregrateOn( ( (GroupHandle) DEUtil.getGroups( inputElement )
							.get( 0 ) ).getName( ) );
				}
				addBinding( column );
				highLightName = column.getName( );
				return ""; 
			}
			ComputedColumnHandle handle = ( (ComputedColumnHandle) element );
			String value = null;
			if ( COLUMN_NAME.equals( property ) )