protected function setup_legacy_properties() {

		// Only run this one time.
		if ( ! empty( $this->legacy_properties ) ) {
			return;
		}

		$properties = $this->get_legacy_property_list();
		$params     = $this->params;
		$lp         =& $this->legacy_properties;

		foreach ( $properties as $property ) {
			switch ( $property ) {
				case 'enable_create_step' :
					$lp['enable_create_step'] = $params['screens']['create']['enabled'];
					break;

				case 'enable_edit_item' :
					$lp['enable_edit_item'] = $params['screens']['edit']['enabled'];
					break;

				case 'enable_admin_item' :
					$lp['enable_admin_item'] = $params['screens']['admin']['enabled'];
					break;

				case 'create_step_position' :
					$lp['create_step_position'] = $params['screens']['create']['position'];
					break;

				// Note: 'admin' becomes 'edit' to distinguish from Dashboard 'admin'.
				case 'admin_name' :
					$lp['admin_name'] = $params['screens']['edit']['name'];
					break;

				case 'admin_slug' :
					$lp['admin_slug'] = $params['screens']['edit']['slug'];
					break;

				case 'create_name' :
					$lp['create_name'] = $params['screens']['create']['name'];
					break;

				case 'create_slug' :
					$lp['create_slug'] = $params['screens']['create']['slug'];
					break;

				case 'admin_metabox_context' :
					$lp['admin_metabox_context'] = $params['screens']['admin']['metabox_context'];
					break;

				case 'admin_metabox_priority' :
					$lp['admin_metabox_priority'] = $params['screens']['admin']['metabox_priority'];
					break;

				default :
					// All other items get moved over.
					$lp[ $property ] = $params[ $property ];

					// Also reapply to the object, for backpat.
					$this->{$property} = $params[ $property ];

					break;
			}
		}
	}