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diff --git a/org.argeo.cms.e4/src/org/argeo/cms/e4/CmsE4Utils.java b/org.argeo.cms.e4/src/org/argeo/cms/e4/CmsE4Utils.java
new file mode 100644
index 000000000..b8ad37e39
--- /dev/null
+++ b/org.argeo.cms.e4/src/org/argeo/cms/e4/CmsE4Utils.java
@@ -0,0 +1,28 @@
+package org.argeo.cms.e4;
+
+import org.argeo.cms.CmsException;
+import org.eclipse.e4.ui.model.application.ui.basic.MPart;
+import org.eclipse.e4.ui.workbench.modeling.EPartService;
+import org.eclipse.e4.ui.workbench.modeling.EPartService.PartState;
+
+public class CmsE4Utils {
+	public static void openEditor(EPartService partService, String editorId, String key, String state) {
+		for (MPart part : partService.getParts()) {
+			String id = part.getPersistedState().get(key);
+			if (id != null && state.equals(id)) {
+				partService.showPart(part, PartState.ACTIVATE);
+				return;
+			}
+		}
+
+		// new part
+		MPart part = partService.createPart(editorId);
+		if (part == null)
+			throw new CmsException("No editor found with id " + editorId);
+		part.getPersistedState().put(key, state);
+		partService.showPart(part, PartState.ACTIVATE);
+	}
+
+	private CmsE4Utils() {
+	}
+}