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.tests/test/org/eclipse/birt/report/model/command/ContentCommandTest.java
DesignElement content2 = new FreeForm( );
		containerHandle.getSlot( 0 ).add( content2.getHandle( design ), 0 );
		assertTrue( container.getSlot( 0 ).getCount( ) == 2 );
		assertEquals( content2, container.getSlot( 0 ).getContent( 0 ) );
		
		DesignElement content3 = new FreeForm( );
		containerHandle.getSlot( 0 ).add( content3.getHandle( design ), 10 );
		assertTrue( container.getSlot( 0 ).getCount( ) == 3 );
		assertEquals( content3, container.getSlot( 0 ).getContent( 2 ) );
		DesignElement content4 = new FreeForm( );
		containerHandle.getSlot( 0 ).add( content4.getHandle( design ), 1 );
		assertTrue( container.getSlot( 0 ).getCount( ) == 4 );
		assertEquals( content2, container.getSlot( 0 ).getContent( 0 ) );
		assertEquals( content4, container.getSlot( 0 ).getContent( 1 ) );
		assertEquals( contentHandle.getElement( ), container.getSlot( 0 )
				.getContent( 2 ) );
		assertEquals( content3, container.getSlot( 0 ).getContent( 3 ) );
	}
	/**
	 * Test method 'remove'.
	 * <p>
	 * Test Case:
	 * <ul>
	 * <li>Normal case
	 * <li>Drop a content which has 'extends', 'name' property and a style.Undo
	 * and redo the operation.
	 * </ul>
	 * 
	 *