private void Client_OnRegistrationForm(object Sender, DataForm Form)
        {
            Field FormType = Form["FORM_TYPE"];

            if (FormType != null && FormType.ValueString == "urn:xmpp:captcha")
            {
                ParameterDialog Dialog = new ParameterDialog(Form);

                MainWindow.currentInstance.Dispatcher.Invoke(() => Dialog.ShowDialog());
            }
            else
            {
                Form.Submit();
            }
        }
        private Task Client_OnRegistrationForm(object _, DataForm Form)
        {
            Field FormType = Form["FORM_TYPE"];

            if (FormType != null && FormType.ValueString == "urn:xmpp:captcha")
            {
                ParameterDialog Dialog = new ParameterDialog(Form);

                MainWindow.UpdateGui(() => Dialog.ShowDialog());
            }
            else
            {
                Form.Submit();
            }

            return(Task.CompletedTask);
        }