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
* @ordered
	 */
	int TITLE_BLOCK__HEIGHT_HINT = LABEL_BLOCK__HEIGHT_HINT;
	/**
	 * The feature id for the '<em><b>Label</b></em>' containment reference.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int TITLE_BLOCK__LABEL = LABEL_BLOCK__LABEL;
	/**
	 * The number of structural features of the '<em>Title Block</em>' class.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int TITLE_BLOCK_FEATURE_COUNT = LABEL_BLOCK_FEATURE_COUNT + 0;
	/**
	 * Returns the meta object for class '
	 * {@link org.eclipse.birt.chart.model.layout.Block <em>Block</em>}'. <!--
	 * begin-user-doc --> <!-- end-user-doc -->
	 * 
	 * @return the meta object for class '<em>Block</em>'.
	 * @see org.eclipse.birt.chart.model.layout.Block
	 * @generated
	 */
	EClass getBlock( );
	/**
	 * Returns the meta object for the containment reference list '{@link org.eclipse.birt.chart.model.layout.Block#getChildren <em>Children</em>}'.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->