CollectionEdito r - Strange behavior: overriden SetItems not being called

[Andreas]

Hi!

I'm using a custom collection with custom items to be edited with a custom
CollectionEdito r. This set of functionality is to be a part of a plugin for
a SharpDevelop-based application.
The strange thing now is that my derived CollectionEdito r's SetItems method
is called when testing the collection editing within a small test
application,
but is NOT called when tested from within the SharpDevelop environment.
Thus whenever I add collection items by clicking Add in the CollectionEdito r
window and then click OK to save those new items, these are lost within
the SharpDevelop application.
What is the reason for SetItems to be called upon clicking the OK button in
the CollectionEdito r window? And what might be the reason for SetItems not
being called although I have modified collection items?

This is the code I'm using:

// This is one single custom item within the collection.
public class Label
{
private string m_Language;
private string m_Value;

[Category ("Attribute" )]
[DesignerSeriali zationVisibilit y (DesignerSerial izationVisibili ty.Visible)]
public string Language
{
get
{
return m_Language;
}
set
{
m_Language = value;
}
}
[Category ("Attribute" )]
[DesignerSeriali zationVisibilit y (DesignerSerial izationVisibili ty.Visible)]
public string Value
{
get
{
return m_Value;
}
set
{
m_Value = value;
}
}
}

// This is the custom collection containing objects of type "Label".
public class Labels : CollectionBase
{
// ... (contents omitted for brevity) ...
}
// This is my editor for the Label collection
public class LabelsEditor : CollectionEdito r
{
private Type[] m_Types;

public LabelsEditor (Type type) : base(type)
{
m_Types = new Type[] {typeof (Label)};
}

protected override Type[] CreateNewItemTy pes()
{
return m_Types;
}

protected override Type CreateCollectio nItemType()
{
return typeof (Label);
}

protected override object CreateInstance( Type ItemType)
{
Label l = (Label) base.CreateInst ance (typeof (Label));
return l;
}

protected override object SetItems(object editValue, object[] value)
{
base.SetItems (editValue, value);
return editValue;
}
}
What needs to be done to make the CollectionEdito r call the SetItems method
in any case? Sorry for possibly being a bit unspecific but I have no idea
where to check for hints about CollectionEdito r showing different behaviors.

Thanks,
Andreas