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diff --git a/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/mutable/UnionTaggedObjectBinding.java b/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/mutable/UnionTaggedObjectBinding.java
new file mode 100644
index 000000000..6dd4cdcd4
--- /dev/null
+++ b/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/mutable/UnionTaggedObjectBinding.java
@@ -0,0 +1,57 @@
+package org.simantics.databoard.binding.mutable;
+
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.binding.UnionBinding;
+import org.simantics.databoard.binding.error.BindingException;
+import org.simantics.databoard.type.UnionType;
+
+/**
+ * Binds UnionType to TaggedObject.class
+ *
+ * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
+ */
+public class UnionTaggedObjectBinding extends UnionBinding {
+
+	public UnionTaggedObjectBinding(UnionType type, Binding[] componentBindings)
+	{
+		this.componentBindings = componentBindings;
+        if (type==null) throw new IllegalArgumentException("null arg");
+		this.type = type;
+	}
+
+	@Override
+	public Object create(int tag, Object value) {
+		TaggedObject result = new TaggedObject();
+		result.tag = tag;
+		result.value = value;
+		return result;
+	}
+	
+	@Override
+	public void setValue(Object union, int tag, Object value)
+	throws BindingException {
+		TaggedObject result = (TaggedObject)union;
+		result.tag = tag;
+		result.value = value;
+	}
+
+	@Override
+	public int getTag(Object obj) throws BindingException {
+		if (!isInstance(obj)) throw new BindingException("Unexpected class "+obj.getClass().getSimpleName()+", TaggedObject expected");
+		TaggedObject to = (TaggedObject) obj;
+		return to.tag;
+	}
+
+	@Override
+	public Object getValue(Object obj) throws BindingException {
+		if (!isInstance(obj)) throw new BindingException("Unexpected class "+obj.getClass().getSimpleName()+", TaggedObject expected");
+		TaggedObject to = (TaggedObject) obj;
+		return to.value;
+	}
+
+	@Override
+	public boolean isInstance(Object obj) {
+		return obj instanceof TaggedObject;
+	}
+	
+}