Bug 207268 Add visibility option for plot within axes
For chart with axes, we should make plot within axes invisible. Meantime, other plots, such as axes, legend and title, should be visible. This enhancement doesn't include UI change, and it is required for cross tab integration.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/layout/LayoutPackage.java
/**
		 * The meta object literal for the '<em><b>Stretch</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute BLOCK__STRETCH = eINSTANCE.getBlock_Stretch( );
		/**
		 * The meta object literal for the '<em><b>Insets</b></em>' containment reference feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EReference BLOCK__INSETS = eINSTANCE.getBlock_Insets( );
		/**
		 * The meta object literal for the '<em><b>Row</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute BLOCK__ROW = eINSTANCE.getBlock_Row( );
		/**
		 * The meta object literal for the '<em><b>Column</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute BLOCK__COLUMN = eINSTANCE.getBlock_Column( );
		/**
		 * The meta object literal for the '<em><b>Rowspan</b></em>' attribute feature.