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/AbstractContentCommand.java
ContentException.DESIGN_EXCEPTION_CONTENT_NOT_FOUND );
	}
	private void doRemove( DesignElement content ) throws SemanticException
	{
		
		ContentRecord dropRecord = new ContentRecord( module, focus, content,
				false );
		dropRecord.setEventTarget( eventTarget );
		ActivityStack stack = getActivityStack( );
		stack.startFilterEventTrans( dropRecord.getLabel( ) );
		try
		{
			doDelectAction( content );
		}
		catch ( SemanticException ex )
		{
			stack.rollback( );
			throw ex;
		}
		
		stack.execute( dropRecord );
		stack.commit( );
	}
	/**
	 * Does some actions when the content is removed from the design tree.
	 * 
	 * @param content
	 *            the content to remove
	 * @param unresolveReference
	 *            status whether to un-resolve the references