Visual Studio Extension: Change Visible Text of Collapsed Blocks

I am writing Visual Studio Extension to customize my editor. I would like to change the text that is displayed when a block of code is compensated.

I've tried the following code:

ITagAggregator<IntraTextAdornmentTag> aggregator;
[...]
aggregator.BatchedTagsChanged += OnBatchedTagsChanged;
[...]
public void OnBatchedTagsChanged(object sender, BatchedTagsChangedEventArgs e)
{
    string newText;
    bool textCreated;
    NormalizedSnapshotSpanCollection list = new NormalizedSnapshotSpanCollection(e.Spans.SelectMany(x => x.GetSpans(textView.TextBuffer)));
    if (list.Count != 0)
    {
        IEnumerable<IMappingTagSpan<IntraTextAdornmentTag>> tags = aggregator.GetTags(list);
        foreach (IMappingTagSpan<IntraTextAdornmentTag> tag in tags)
        {
            if (tag.Tag.Adornment is OutliningCollapsedAdornmentControl)
            {
                NormalizedSnapshotSpanCollection spans = tag.Span.GetSpans(textView.TextSnapshot);
                if (spans.Count == 0) continue;
                OutliningCollapsedAdornmentControl adornmentControl = (OutliningCollapsedAdornmentControl)tag.Tag.Adornment;
                TextBlock textBlock = adornmentControl.GetChild<TextBlock>();
                textCreated = TryCreateText(spans[0], out newText);
                if (textCreated)
                {
                    adornmentControl.Content = newText;
                    textBlock.Text = newText;
                }
            }
        }
    }
}

      

        
        
        
      

    

I change the text, but when it scrolls out of the screen and back, the text reverts to its default.

Edit:

I have also tried passing MSDN .

I work fine if I break the blocks by pressing the "+" sign, but the blocks don't shrink when I use Ctrl + M + O.

I guess the problem is because I am creating pre-existing regions.

Can someone please tell me what can I do?

(Tested in both VS2010 and VS2013 with the same result)