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/render/AxesRenderer.java
bl,
							getRunTimeContext( ).getScriptContext( ) );
					getRunTimeContext( ).notifyStructureChange( IStructureDefinitionListener.BEFORE_DRAW_BLOCK,
							bl );
					renderTitle( idr, (TitleBlock) bl );
					ScriptHandler.callFunction( sh,
							ScriptHandler.AFTER_DRAW_BLOCK,
							bl,
							getRunTimeContext( ).getScriptContext( ) );
					getRunTimeContext( ).notifyStructureChange( IStructureDefinitionListener.AFTER_DRAW_BLOCK,
							bl );
				}
				else if ( bl instanceof LabelBlock )
				{
					ScriptHandler.callFunction( sh,
							ScriptHandler.BEFORE_DRAW_BLOCK,
							bl,
							getRunTimeContext( ).getScriptContext( ) );
					getRunTimeContext( ).notifyStructureChange( IStructureDefinitionListener.BEFORE_DRAW_BLOCK,
							bl );
					renderLabel( idr, bl, StructureSource.createUnknown( bl ) );
					ScriptHandler.callFunction( sh,
							ScriptHandler.AFTER_DRAW_BLOCK,
							bl,
							getRunTimeContext( ).getScriptContext( ) );
					getRunTimeContext( ).notifyStructureChange( IStructureDefinitionListener.AFTER_DRAW_BLOCK,
							bl );
				}
				else if ( bl instanceof Legend )
				{