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diff --git a/bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/ExpandNodeHandler.java b/bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/ExpandNodeHandler.java
new file mode 100644
index 000000000..c5553a2a2
--- /dev/null
+++ b/bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/ExpandNodeHandler.java
@@ -0,0 +1,74 @@
+package org.simantics.modeling.ui;
+
+import java.util.Arrays;
+import java.util.Comparator;
+
+import org.simantics.browsing.ui.BuiltinKeys;
+import org.simantics.browsing.ui.GraphExplorer;
+import org.simantics.browsing.ui.NodeContext;
+import org.simantics.browsing.ui.PrimitiveQueryProcessor;
+import org.simantics.browsing.ui.common.processors.IsExpandedProcessor;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.layer0.SelectionHints;
+import org.simantics.ui.DoubleClickEvent;
+import org.simantics.ui.IDoubleClickAction;
+import org.simantics.ui.workbench.action.IWorkbenchActionHints;
+import org.simantics.ui.workbench.editor.EditorAdapter;
+import org.simantics.ui.workbench.editor.EditorRegistry;
+import org.simantics.utils.ui.ISelectionUtils;
+import org.simantics.utils.ui.action.IPriorityAction;
+import org.simantics.utils.ui.action.PriorityAction;
+
+/**
+ * @author Tuukka Lehtonen
+ */
+public class ExpandNodeHandler implements IDoubleClickAction {
+
+    @Override
+    public void doubleClickEvent(DoubleClickEvent e) throws DatabaseException {
+        ReadGraph g = e.getGraph();
+        final NodeContext node = ISelectionUtils.getSinglePossibleKey(e.getResource(), SelectionHints.KEY_MAIN, NodeContext.class);
+        if (node == null)
+            return;
+
+        Object widget = e.getHintContext().getHint(IWorkbenchActionHints.KEY_WIDGET);
+        if (!(widget instanceof GraphExplorer))
+            return;
+        final GraphExplorer explorer = (GraphExplorer) widget;
+
+        EditorAdapter[] editorAdapters = EditorRegistry.getInstance().getAdaptersFor(g, node);
+
+        Arrays.sort(editorAdapters, new Comparator<EditorAdapter>() {
+            @Override
+            public int compare(EditorAdapter o1, EditorAdapter o2) {
+                // Sort in descending priority order
+                return -(o1.getPriority() - o2.getPriority());
+            }
+        });
+
+        // If editor selection is unanimous, use the editor. Otherwise just expand/collapse the clicked node.
+        if (editorAdapters.length == 0) {
+            e.add(expandAction(explorer, node));
+            e.consume();
+        } else if (editorAdapters.length > 1 && editorAdapters[0].getPriority() == editorAdapters[1].getPriority()) {
+            e.add(expandAction(explorer, node));
+            e.consume();
+        }
+    }
+
+    private IPriorityAction expandAction(final GraphExplorer explorer, final NodeContext node) {
+        return new PriorityAction(100) {
+            @Override
+            public void run() {
+                PrimitiveQueryProcessor<?> pqp = explorer.getPrimitiveProcessor(BuiltinKeys.IS_EXPANDED);
+                if (pqp instanceof IsExpandedProcessor) {
+                    IsExpandedProcessor iep = (IsExpandedProcessor) pqp;
+                    boolean expanded = iep.getExpanded(node);
+                    iep.replaceExpanded(node, !expanded);
+                }
+            }
+        };
+    }
+
+}