From: Christopher Yeoh <yeohc@au1.ibm.com>

The LL Server sets the CreateSelected flag for a prim when sending a
property update when objects are linked. The following patch 
gets OpenSim to do the same.

OpenSim/Region/Environment/Scenes/SceneObjectGroup.cs

@@ -1756,6 +1756,7 @@ namespace OpenSim.Region.Environment.Scenes
             linkPart.LinkNum = m_parts.Count;
 
             linkPart.SetParent(this);
+           linkPart.AddFlag(LLObject.ObjectFlags.CreateSelected);
 
             //if (linkPart.PhysActor != null)
             //{