Bug 63267 [RCP] tab style for M9
the tab style in the IDE in M9 should use the curved style
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/IDEWorkbenchAdvisor.java
*/
    public void openIntro(IWorkbenchWindowConfigurer windowConfigurer) {
        if (editorsAndIntrosOpened) 
            return;
        editorsAndIntrosOpened = true;
        
        
        if (windowConfigurer.getWorkbenchConfigurer().getWorkbench().getIntroManager().hasIntro())
            super.openIntro(windowConfigurer);
        else {        
			try {
				openWelcomeEditors(windowConfigurer.getWindow());
			} catch (WorkbenchException e) {
				IDEWorkbenchPlugin.log("Fail to open remaining welcome editors.", e.getStatus()); 
			}        
	
			
			IDEWorkbenchPlugin.getDefault().savePluginPreferences();
        }
    }
    /**
     * Returns the workbench action builder for the given window 
     * @param window
     * @return WorkbenchActionBuilder
     */
    static WorkbenchActionBuilder getActionBuilder(IWorkbenchWindow window) {
        IWorkbenchWindowConfigurer configurer = workbenchAdvisor.getWorkbenchConfigurer().getWindowConfigurer(window);
		return (WorkbenchActionBuilder) configurer.getData("ActionBuilder"); 
    }
}