Dynamically Adding TextBox using a Button within MVVM framework

Question

I keep climbing the steep WPF hill! So I want to create a UI that allows the user to dynamically add a text box. To do this they would hit a button.

I've managed to create this using code behind but I want to move towards an MVVM structure so I don't have any code in the view. I've tried ICommand and ObservableCollection but I'm missing something and I don't know where. Here is my simple example.

XAML: Very basic with one button that adds a row.

<Window x:Class="WPFpractice072514.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WPFpractice072514"
        Title="MainWindow" Height="350" Width="525">
    <Grid Name="mymy" >
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto" />
            <ColumnDefinition Width="Auto" />
        </Grid.ColumnDefinitions>
        <Button Grid.Column="0" Grid.Row="0" Name="ButtonUpdateArtist"
                Content="Add TextBox" Click="ButtonAddTexboxBlockExecute" />

    </Grid>
</Window>

C# Code Behind

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WPFpractice072514
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        #region members
        int count = 0;
        #endregion

        public MainWindow()
        {
            InitializeComponent();
        }

        private void ButtonAddTexboxBlockExecute(Object Sender, RoutedEventArgs e)
        {
            TextBox t = new TextBox();
            t.Height = 20;
            t.Width = 20;
            t.Name = "button";

            RowDefinition rowDef1;
            rowDef1 = new RowDefinition();
            mymy.RowDefinitions.Add(rowDef1);

            ColumnDefinition colDef1;
            colDef1 = new ColumnDefinition();
            mymy.ColumnDefinitions.Add(colDef1);
            ++count;

            mymy.Children.Add(t);

            Grid.SetColumn(t, 1);
            Grid.SetRow(t, count);

        }
    }
}

Questions: What code (XAML and C#) do I need to be able to move the method out of the code behind and into a viewmodel?

Can you use commands to dynamically add a textbox?

I'm assuming that the textboxes must be kept in a container which in this case is what grid is for. But if I'm using an MVVM do I need to contain the textboxes in a listview or some other container that uses ItemsSource?

Answer 1

[link][1]

 class TestViewModel : BindableBase  
    {  
        private TestModel testModel;  

        public ICommand AddCommand { get; private set; }  
        public TestViewModel(StackPanel stkpnlDynamicControls)  
        {  
            testModel = new TestModel();  
            TestModel.stkPanel = stkpnlDynamicControls;  
            AddCommand = new DelegateCommand(AddMethod);  
        }  
        public TestModel TestModel  
        {  
            get { return testModel; }  
            set { SetProperty(ref testModel, value); }  
        }  
        private void AddMethod()  
        {  
            Label lblDynamic = new Label()  
            {  
                Content = "This is Dynamic Label"  
            };  
            TestModel.stkPanel.Children.Add(lblDynamic);  
        }  
    }