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SWT plans to introduces Vertical CTabFolder layout via bug 58945 Raising this bug for supporting this feature in Eclipse platform-UI.
Starting point: Eclipse Platform-UI uses CTabFolder and has customized CTabFolderRenderer, it basically extends CTabFolderRenderer.java only. To start with, suggest to clone below platform-UI repository: git://git.eclipse.org/gitroot/platform/eclipse.platform.ui.git Once you have the platform-UI projects imported into your workspace. Open "Type Hierarchy" for SWT CTabFolderRenderer.java, you should see custom CTabRendering.java class