public void Highlight(List <ActivityDesigner> highlightedDesigners)
{
if (highlightedDesigners == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("hightlightedDesigners");
}
glyphProviderService = this.GetService(typeof(IDesignerGlyphProviderService)) as IDesignerGlyphProviderService;
workflowView = GetService(typeof(WorkflowView)) as WorkflowView;
RemoveCurrentHighlight();
IDesignerHost designerHost = this.GetService(typeof(IDesignerHost)) as IDesignerHost;
DesignerHighlighterMesageFilter messageFilter = new DesignerHighlighterMesageFilter();
highlightProvider = new HighlightGlyphProvider(designerHost.GetDesigner(designerHost.RootComponent) as ActivityDesigner, highlightedDesigners);
glyphProviderService.AddGlyphProvider(highlightProvider);
highlightProvider.MessageFilter = messageFilter;
messageFilter.MouseDown += new EventHandler <System.Windows.Forms.MouseEventArgs>(messageFilter_MouseDown);
messageFilter.KeyDown += new EventHandler <System.Windows.Forms.KeyEventArgs>(messageFilter_KeyDown);
workflowView.AddDesignerMessageFilter(messageFilter);
workflowView.FitToScreenSize();
}