Bug 233285 [TabbedProperties] Adopt API tooling
The tabbed properties plug-in is still not API tooling enabled.
bundles/org.eclipse.ui.views.properties.tabbed/src/org/eclipse/ui/views/properties/tabbed/TabbedPropertySheetPage.java
/**
		 * Shows the given tab.
		 */
		private void showTab(TabContents target) {
			if (target != null) {
				Composite tabComposite = (Composite) tabToComposite.get(target);
				if (tabComposite != null) {
					/**
					 * the following method call order is important - do not
					 * change it or the widgets might be drawn incorrectly
					 */
					tabComposite.moveAbove(null);
					target.aboutToBeShown();
					tabComposite.setVisible(true);
				}
			}
		}
		/**
		 * Hides the given tab.
		 */
		private void hideTab(TabContents target) {
			if (target != null) {
				Composite tabComposite = (Composite) tabToComposite.get(target);
				if (tabComposite != null) {
					target.aboutToBeHidden();
					tabComposite.setVisible(false);
				}
			}
		}
	}