void UpdatePreview()
        {
            XshdSyntaxDefinition xshd = (XshdSyntaxDefinition)languageComboBox.SelectedItem;

            if (xshd != null)
            {
                var customizationsForCurrentLanguage = customizationList.Where(c => c.Language == null || c.Language == xshd.Name);
                CustomizingHighlighter.ApplyCustomizationsToDefaultElements(textEditor, customizationsForCurrentLanguage);
                ApplyToRendering(textEditor, customizationsForCurrentLanguage);
                var      item     = (IHighlightingItem)listBox.SelectedItem;
                TextView textView = textEditor.TextArea.TextView;
                foldingManager.Clear();
                textMarkerService.RemoveAll(m => true);
                textView.LineTransformers.Remove(colorizer);
                colorizer = null;
                if (item != null)
                {
                    if (item.ParentDefinition != null)
                    {
                        var highlighter = new CustomizingHighlighter(
                            new DocumentHighlighter(textView.Document, item.ParentDefinition),
                            customizationsForCurrentLanguage
                            );
                        colorizer = new HighlightingColorizer(highlighter);
                        textView.LineTransformers.Add(colorizer);
                    }
                    textEditor.Select(0, 0);
                    bracketHighlighter.SetHighlight(null);
                    textEditor.Options.HighlightCurrentLine = false;
                    item.ShowExample(textEditor.TextArea);
                    ITextMarker m = textMarkerService.TextMarkers.SingleOrDefault();
                    if (m != null && m.Tag != null)
                    {
                        ((Action <IHighlightingItem, ITextMarker>)m.Tag)(item, m);
                    }
                }
            }
        }
		void UpdatePreview()
		{
			XshdSyntaxDefinition xshd = (XshdSyntaxDefinition)languageComboBox.SelectedItem;
			if (xshd != null) {
				var customizationsForCurrentLanguage = customizationList.Where(c => c.Language == null || c.Language == xshd.Name);
				CustomizingHighlighter.ApplyCustomizationsToDefaultElements(textEditor, customizationsForCurrentLanguage);
				ApplyToRendering(textEditor, customizationsForCurrentLanguage);
				var item = (IHighlightingItem)listBox.SelectedItem;
				TextView textView = textEditor.TextArea.TextView;
				foldingManager.Clear();
				textMarkerService.RemoveAll(m => true);
				textView.LineTransformers.Remove(colorizer);
				colorizer = null;
				if (item != null) {
					if (item.ParentDefinition != null) {
						var highlighter = new CustomizingHighlighter(
							new DocumentHighlighter(textView.Document, item.ParentDefinition),
							customizationsForCurrentLanguage
						);
						colorizer = new HighlightingColorizer(highlighter);
						textView.LineTransformers.Add(colorizer);
					}
					textEditor.Select(0, 0);
					bracketHighlighter.SetHighlight(null);
					item.ShowExample(textEditor.TextArea);
					ITextMarker m = textMarkerService.TextMarkers.SingleOrDefault();
					if (m != null && m.Tag != null) {
						((Action<IHighlightingItem, ITextMarker>)m.Tag)(item, m);
					}
				}
			}
		}