I've found solution thanks to .NET Reflector and reflection mechanism. Instead of using SetItems method I'm invoking private method of CollectionForm: private void AddItems(IList instances) , like this: MethodInfo methodInfo = m_collectionForm.GetType().GetMethod("AddItems", BindingFlags.NonPublic | BindingFlags.Instance); methodInfo.Invoke(m_collectionForm, new object[] { /* my items here */ }); PS. See the rest of code in previous post... A man has got to know his limitations. Harry Callahan

Putting those food stamps to good use eh?

s.t.a.v.o wrote: Google didn't helped me yet, still searching... Did you try this? [^] led mike

hey if you have found solution......????please help .....i have same problem.....