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
{
			throw e;
		}
		catch ( NameException e )
		{
			throw e;
		}
		doAdd( newPos, content );
	}
	/**
	 * Validates the context before adding an element.
	 * 
	 * @param content
	 *            the element to add
	 * @throws ContentException
	 *             if <code>content</code> cannot resides in
	 * @throws NameException
	 *             if the name of <code>content</code> duplicates with others
	 */
	protected void checkBeforeAdd( DesignElement content )
			throws ContentException, NameException
	{
		
		ElementDefn metaData = (ElementDefn) element.getDefn( );
		if ( !metaData.isContainer( ) )
			throw ContentExceptionFactory.createContentException( focus,
					ContentException.DESIGN_EXCEPTION_NOT_CONTAINER );
		IContainerDefn containerDefn = focus.getContainerDefn( );
		if ( containerDefn == null )
			throw ContentExceptionFactory.createContentException( focus,