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
{
				BackRefRecord record = new ElementBackRefRecord( module,
						referred, client, ref.propName );
				getActivityStack( ).execute( record );
			}
			else
			{
				if ( ( (DesignElement) referred ).isStyle( ) )
				{
					StyleCommand clientCmd = new StyleCommand( module, client );
					clientCmd.setStyleElement( (DesignElement) null );
				}
				else
				{
					if ( ref.getCachedMemberRef( ) != null )
					{
						CachedMemberRef cachedMemberRef = ref
								.getCachedMemberRef( );
						ComplexPropertyCommand cmd = new ComplexPropertyCommand(
								module, client );
						cmd.removeItem( new CachedMemberRef( cachedMemberRef
								.getPropDefn( ) ), cachedMemberRef.getIndex( ) );
					}
					else if ( ref.getPropertyName( ) != null )
					{
						PropertyCommand cmd = new PropertyCommand( module,
								client );
						cmd.setProperty( ref.propName, null );
					}
				}