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/ContentElementCommand.java
return makeLocalCompositeValue( element, prop, content );
	}
	/**
	 * The property is a simple value list. If property is a list property, the
	 * method will check to see if the current element has the local list value,
	 * if it has, the method returns, otherwise, a copy of the list value
	 * inherited from container or parent will be set locally on the element
	 * itself.
	 * <p>
	 * This method is supposed to be used when we need to change the value of a
	 * composite property( a simple list property ). These kind of property is
	 * inherited as a whole, so when the value changed from a child element.
	 * This method will be called to ensure that a local copy will be made, so
	 * change to the child won't affect the original value in the parent.
	 * 
	 * @param ref
	 *            a reference to a list property or member.
	 */
	private DesignElement makeLocalCompositeValue( DesignElement topElement,
			ElementPropertyDefn prop, DesignElement content )
	{
		
		Object localValue = topElement.getLocalProperty( module, prop );
		if ( localValue != null )
			return content;
		
		Object inherited = topElement.getProperty( module, prop );
		
		if ( inherited == null )
			return null;