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
* @generated
		 */
		EReference BLOCK__BACKGROUND = eINSTANCE.getBlock_Background( );
		/**
		 * The meta object literal for the '<em><b>Visible</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute BLOCK__VISIBLE = eINSTANCE.getBlock_Visible( );
		/**
		 * The meta object literal for the '<em><b>Triggers</b></em>' containment reference list feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EReference BLOCK__TRIGGERS = eINSTANCE.getBlock_Triggers( );
		/**
		 * The meta object literal for the '<em><b>Width Hint</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		EAttribute BLOCK__WIDTH_HINT = eINSTANCE.getBlock_WidthHint( );
		/**
		 * The meta object literal for the '<em><b>Height Hint</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */