private void InvokeMethod()
{
var listBox = (ListBox)PnlPropertyContainer.Children[0];
var paramCtrls = (listBox.Items.Cast <ParamCtrlItemModel>()).ToList();
var methLauncher = new MethodLuncher(_externalServiceMethods, this.SelectedMethod, RunAuthentication, paramCtrls,
SelectedEndpoint.Uri);
var jsonDecorator = new JsonLauncherDecorator();
jsonDecorator.SetLauncher(methLauncher);
var outputLogger = new OutputLogger();
outputLogger.SetLauncher(jsonDecorator);
outputLogger.SetSelMethod(SelectedMethod);
RichMessage.Document = (FlowDocument)outputLogger.Invoke();
}