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 feature id for the '<em><b>Triggers</b></em>' containment reference list.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int BLOCK__TRIGGERS = 13;
	/**
	 * The feature id for the '<em><b>Width Hint</b></em>' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int BLOCK__WIDTH_HINT = 14;
	/**
	 * The feature id for the '<em><b>Height Hint</b></em>' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int BLOCK__HEIGHT_HINT = 15;
	/**
	 * The number of structural features of the '<em>Block</em>' class.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int BLOCK_FEATURE_COUNT = 16;