Bug 188829 Move the item ,the trans of the model don't close.
1:New report design. 2:Add a Embedded image. 3:Add another imge , then drag the second imge to the first position. 4:Change the size of the first image. Expected: Image change the size. Now: Image size don't change.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ContentCommand.java
IReportItemModel.BOUND_DATA_COLUMNS_PROP );
			if ( boundColumns == null || boundColumns.isEmpty( ) )
				return;
			String groupName = (String) content.getProperty( module,
					IGroupElementModel.GROUP_NAME_PROP );
			List toCleared = new ArrayList( );
			for ( int i = 0; i < boundColumns.size( ); i++ )
			{
				ComputedColumn column = (ComputedColumn) boundColumns.get( i );
				String aggregateGroup = column.getAggregateOn( );
				if ( aggregateGroup != null
						&& aggregateGroup.equals( groupName ) )
					toCleared.add( new Integer( i ) );
			}
			StructPropertyDefn structPropDefn = (StructPropertyDefn) MetaDataDictionary
					.getInstance( ).getStructure(
							ComputedColumn.COMPUTED_COLUMN_STRUCT ).getMember(
							ComputedColumn.AGGREGATEON_MEMBER );
			ElementPropertyDefn propDefn = tmpContainer
					.getPropertyDefn( IReportItemModel.BOUND_DATA_COLUMNS_PROP );
			try
			{
				for ( int i = 0; i < toCleared.size( ); i++ )
				{
					int columnIndex = ( (Integer) toCleared.get( i ) )
							.intValue( );
					CachedMemberRef memberRef = new CachedMemberRef( propDefn,
							columnIndex, structPropDefn );
					PropertyCommand propCmd = new PropertyCommand( module,
							tmpContainer );