public void SetSource(MemberInfo memberInfo, IEnumerable<HighlightItem> highlightItems, CancellationToken cancelToken)
        {
            if (memberInfo == null)
            {
                return;
            }

            this.MemberInfo = memberInfo;
            this.lastHighlightItems = (highlightItems ?? new HighlightItem[0]).ToList();

            if (!this.Enabled)
            {
                return;
            }

            try
            {
                this.OnProgressChanged(false);
                lock (this)
                {
                    if (this.MemberInfo != memberInfo)
                    {
                        // it changed while waiting in the lock
                        return;
                    }

                    this.InvokeIfRequired(() =>
                    {
                        this.Reset();

                        if (this.MethodChanged != null)
                        {
                            this.MethodChanged(this, new EventArgs());
                        }
                    });

                    this.TextBox = this.CreateTextBox();
                    this.Reset();

                    Highlighter highlighter = new Highlighter(this, highlightItems);

                    DecompilerSettings settings = new DecompilerSettings()
                    {
                        UsingDeclarations = this.ShowUsing,
                        ShowXmlDocumentation = this.ShowXmlDoc,
                        UseDebugSymbols = true
                    };

                    settings.AnonymousMethods =
                        settings.ExpressionTrees =
                        settings.YieldReturn =
                        settings.AutomaticProperties =
                        settings.AutomaticEvents =
                        settings.UsingStatement =
                        settings.ForEachStatement =
                        settings.LockStatement =
                        settings.SwitchStatementOnString =
                        settings.QueryExpressions =
                        settings.ObjectOrCollectionInitializers = this.DecompileLanguageFeatures;

                    // vb.net stuff:
                    settings.IntroduceIncrementAndDecrement = settings.AlwaysGenerateExceptionVariableForCatchBlocks = this.DecompileLanguageFeatures;

                    if (memberInfo is PropertyInfo)
                    {
                        ((PropertyInfo)memberInfo).DecompileProperty(highlighter, settings);
                    }
                    else
                    {
                        ((MethodBase)memberInfo).DecompileMethod(highlighter, settings);
                    }

                    highlighter.Complete();
                    int pos = this.TextBox.SelectionStart;

                    string rtf = this.TextBox.Rtf;

                    this.TextBox = this.DisplayedTextBox;

                    this.InvokeIfRequired(() =>
                    {
                        if (first)
                        {
                            this.DisplayedTextBox.ScrollBars = RichTextBoxScrollBars.ForcedBoth;
                            this.DisplayedTextBox.ScrollBars = RichTextBoxScrollBars.Both;
                            this.first = false;
                        }
                        this.Reset();
                        this.DisplayedTextBox.Rtf = rtf;
                        this.DisplayedTextBox.Select(pos, 0);
                        this.DisplayedTextBox.ScrollToCaret();
                    });
                }
            }
            finally
            {
                this.OnProgressChanged(true);
            }
        }