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
* <li>Drop and unresolve one style
	 * <li>Drop one style
	 * </ul>
	 * 
	 * @throws Exception
	 */
	public void testStyleReferenceAfterDeletionAndDetachment( )
			throws Exception
	{
		
		createStyleAndLabel( );
		StyleHandle styleHandle = designHandle.findStyle( "style" );
		LabelHandle labelHandle = (LabelHandle) designHandle
				.findElement( "label" );
		styleHandle.dropAndClear( );
		assertEquals( null, labelHandle.getStyle( ) );
		assertEquals( null, labelHandle
				.getStringProperty( LabelHandle.STYLE_PROP ) );
		Iterator iter = styleHandle.clientsIterator( );
		assertEquals( false, iter.hasNext( ) );
		designHandle.getCommandStack( ).undo( );
		assertEquals( styleHandle.getName( ), labelHandle
				.getStringProperty( LabelHandle.STYLE_PROP ) );
		assertEquals( styleHandle, labelHandle.getStyle( ) );
		iter = styleHandle.clientsIterator( );
		assertEquals( true, iter.hasNext( ) );
		
		createStyleAndLabel( );
		styleHandle = designHandle.findStyle( "style" );
		labelHandle = (LabelHandle) designHandle.findElement( "label" );