RCPでViewのタブを斜めにする方法

public class ApplicationWorkbenchAdvisor extends WorkbenchAdvisor {	
    @Override
    public void initialize(IWorkbenchConfigurer configurer) {
        super.initialize(configurer);       PlatformUI.getPreferenceStore().setValue(IWorkbenchPreferenceConstants.SHOW_TRADITIONAL_STYLE_TABS, false);
    }
}

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