Bug 136241 [regression]Preview template in web viewer and pdf didn't get correct effect.
Description: Preview template items in web viewer and pdf didn't get correct effect. Steps to reproduce: 1. Create template items. 2. Preview in Web Viewer and pdf. Expected result: Same effect as in html. Actual result: In web viewer, see only blank box. In pdf, blank page.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ContentCommand.java
* @return true if the content can be moved within the slot, otherwise
	 *         false.
	 */
	private boolean canMovePosition( DesignElement content, int slotID,
			int newPosn )
	{
		if ( element instanceof ReportDesign
				&& slotID == ReportDesign.COMPONENT_SLOT )
		{
			List derived = content.getDerived( );
			ContainerSlot slot = element.getSlot( slotID );
			Iterator iter = derived.iterator( );
			while ( iter.hasNext( ) )
			{
				DesignElement child = (DesignElement) iter.next( );
				if ( slot.contains( child ) )
				{
					
					
					if ( slot.findPosn( child ) <= newPosn )
						return false;
				}
			}
			DesignElement e = content.getExtendsElement( );
			while ( e != null )
			{
				
				
				if ( slot.findPosn( e ) >= newPosn )
					return false;