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diff --git a/bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/UpdateRunner.java b/bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/UpdateRunner.java
new file mode 100644
index 000000000..3d90dfac5
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+++ b/bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/UpdateRunner.java
@@ -0,0 +1,135 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2012 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.browsing.ui.swt;
+
+import java.util.HashSet;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.widgets.Control;
+import org.eclipse.swt.widgets.TreeItem;
+import org.simantics.browsing.ui.BuiltinKeys;
+import org.simantics.browsing.ui.CheckedState;
+import org.simantics.browsing.ui.NodeContext;
+import org.simantics.browsing.ui.NodeQueryManager;
+import org.simantics.browsing.ui.common.internal.GENodeQueryManager;
+import org.simantics.browsing.ui.common.internal.IGraphExplorerContext;
+import org.simantics.browsing.ui.content.PrunedChildrenResult;
+
+/**
+ * This class is responsible for updating the {@link TreeItem}s contained by the
+ * SWT Tree in {@link GraphExplorerImpl}.
+ * 
+ * It will reschedule itself for as long as there are UI items to update in the
+ * explorer. This class is not responsible for performing any throttling of
+ * <code>UpdateRunner</code> executions.
+ * 
+ * @author Antti Villberg
+ */
+class UpdateRunner implements Runnable {
+
+    final GraphExplorerImpl ge;
+    //final IGraphExplorerContext geContext;
+
+    UpdateRunner(GraphExplorerImpl ge, IGraphExplorerContext geContext) {
+        this.ge = ge;
+      //  this.geContext = geContext;
+    }
+
+    public void run() {
+    	try {
+    		doRun();
+    	} catch (Throwable t) {
+    		t.printStackTrace();
+    	}
+    	
+    }
+
+    public void doRun() {
+    	
+        if (ge.isDisposed())
+            return;
+
+        HashSet<TreeItem> items = new HashSet<TreeItem>();
+        boolean doRoot;
+
+        synchronized (ge.pendingItems) {
+
+            doRoot = ge.pendingRoot;
+            
+            for (TreeItem item : ge.pendingItems) {
+                //if(item.isDisposed()) continue;
+                //if(item.getParentItem() == null) doRoot = true;
+                //else items.add(item.getParentItem());
+                if (item == null) {
+                    doRoot = true;
+                } else {
+                    if(item.isDisposed()) continue;
+                    items.add(item);
+                }
+            }
+
+            ge.pendingItems = new HashSet<TreeItem>();
+            ge.pendingRoot = false;
+
+        }
+
+        if (doRoot) {
+
+            NodeQueryManager manager = new GENodeQueryManager(ge.explorerContext, null, null, TreeItemReference.create(null));
+
+            PrunedChildrenResult children = manager.query(ge.rootContext, BuiltinKeys.PRUNED_CHILDREN);
+            int maxChildren = ge.getMaxChildren(manager, ge.rootContext);
+            int childCount = Math.min(children.getPrunedChildren().length, maxChildren);
+            ge.tree.clearAll(true);
+            ge.tree.setItemCount(childCount);
+
+        } else {
+
+            int itemIndex = 0;
+            for (TreeItem item : items) {
+                if (item.isDisposed())
+                    continue;
+
+                final NodeContext context = (NodeContext)item.getData();
+                assert(context != null);
+
+                NodeQueryManager manager = new GENodeQueryManager(ge.explorerContext, null, null, TreeItemReference.create(item));
+
+                PrunedChildrenResult children = manager.query(context, BuiltinKeys.PRUNED_CHILDREN);
+
+                int maxChildren = ge.getMaxChildren(manager, context);
+                item.setItemCount(Math.min(children.getPrunedChildren().length, maxChildren));
+
+                ge.setTextAndImage(item, manager, context, itemIndex);
+
+                item.clearAll(true);
+
+                boolean isExpanded = manager.query(context, BuiltinKeys.IS_EXPANDED);
+                item.setExpanded(isExpanded);
+
+                if ((((Control) ge.getControl()).getStyle() & SWT.CHECK) != 0) {
+                    CheckedState checked = manager.query(context, BuiltinKeys.IS_CHECKED);
+                    item.setChecked(CheckedState.CHECKED_STATES.contains(checked));
+                    item.setGrayed(CheckedState.GRAYED == checked);
+                }
+
+                ++itemIndex;
+            }
+        }
+
+        synchronized (ge.pendingItems) {
+            if (!ge.scheduleUpdater())
+                ge.updating = false;
+        }
+    }
+
+}