private void btnEdit_Click(object sender, RoutedEventArgs e)
        {
            var selectedAccount = dcAgentsList.SelectedItem as AgentsView;

            Storyboard sb;
            if (selectedAccount != null)
            {
                if (_isExpanded != true)
                {
                    AgentsForm.AgentId = selectedAccount.AgentId;

                    var page = new AgentsForm();
                    navigation.Navigate(page);

                    sb = this.FindResource("gridin") as Storyboard;
                    sb.Begin(this);
                    _isExpanded = !_isExpanded;
                }
                else
                {
                    sb = this.FindResource("gridout") as Storyboard;
                    sb.Begin(this);
                    _isExpanded = !_isExpanded;

                    navigation.BackNavigationMode = BackNavigationMode.Root;
                    navigation.GoBack();
                }
            }
            else
            {
                NullMessage();
            }
        }
        private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            Storyboard sb;
            if (_isExpanded != true)
            {
                AgentsForm.AgentId = 0;

                sb = this.FindResource("gridin") as Storyboard;
                sb.Begin(this);
                _isExpanded = !_isExpanded;

                var page = new AgentsForm();
                navigation.Navigate(page);
            }
            else
            {
                sb = this.FindResource("gridout") as Storyboard;
                sb.Begin(this);
                _isExpanded = !_isExpanded;

                LoadAgents();
            }
        }