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When a composite's child gets disposed there aren't any layout problems. Shouldn't the same apply to CTabFolder? Display display = new Display(); Shell shell = new Shell(display, SWT.SHELL_TRIM); shell.setLayout(new FillLayout()); CTabFolder folder = new CTabFolder(shell, SWT.CLOSE); Composite c = new Composite(folder, SWT.NONE); folder.setTopRight(c); c.dispose(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); Exception in thread "main" org.eclipse.swt.SWTException: Widget is disposed at org.eclipse.swt.SWT.error(SWT.java:4270) at org.eclipse.swt.SWT.error(SWT.java:4185) at org.eclipse.swt.SWT.error(SWT.java:4156) at org.eclipse.swt.widgets.Widget.error(Widget.java:468) at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:340) at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:226) at org.eclipse.swt.custom.CTabFolder.setButtonBounds(CTabFolder.java:2169) at org.eclipse.swt.custom.CTabFolder.updateItems(CTabFolder.java:3348) at org.eclipse.swt.custom.CTabFolder.updateItems(CTabFolder.java:3281) at org.eclipse.swt.custom.CTabFolder.onResize(CTabFolder.java:1744) at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:263) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1058) at org.eclipse.swt.widgets.Control.WM_SIZE(Control.java:5156) at org.eclipse.swt.widgets.Scrollable.WM_SIZE(Scrollable.java:291) at org.eclipse.swt.widgets.Composite.WM_SIZE(Composite.java:1662) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4586) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4957) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2520) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.WM_WINDOWPOSCHANGED(Control.java:5391) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4599) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4957) at org.eclipse.swt.internal.win32.OS.SetWindowPos(Native Method) at org.eclipse.swt.widgets.Widget.SetWindowPos(Widget.java:1457) at org.eclipse.swt.widgets.Control.setBounds(Control.java:3111) at org.eclipse.swt.widgets.Composite.setBounds(Composite.java:1019) at org.eclipse.swt.widgets.Control.setBounds(Control.java:3072) at org.eclipse.swt.widgets.Control.setBounds(Control.java:3068) at org.eclipse.swt.layout.FillLayout.layout(FillLayout.java:201) at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1263) at org.eclipse.swt.widgets.Composite.WM_SIZE(Composite.java:1673) at org.eclipse.swt.widgets.Canvas.WM_SIZE(Canvas.java:454) at org.eclipse.swt.widgets.Decorations.WM_SIZE(Decorations.java:1790) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4586) at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:341) at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1610) at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:2061) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4957) at org.eclipse.swt.internal.win32.OS.ShowWindow(Native Method) at org.eclipse.swt.widgets.Decorations.setVisible(Decorations.java:1390) at org.eclipse.swt.widgets.Shell.setVisible(Shell.java:1888) at org.eclipse.swt.widgets.Shell.open(Shell.java:1229)
Fixed > 20120625 in 4.3 M1 Commit: http://git.eclipse.org/c/platform/eclipse.platform.swt.git/commit/?id=d2bbe0af593cdec5f8615e936375cdcda0ff106f You really should set topRight to null after disposing the control. However, we decided to protect against people doing this anyway by checking !control.isDisposed() in a bunch of places and rendering without failing.
