WPF

<HierarchicalDataTemplate DataType="{x:Type models:JobSummaryModel}"
                            ItemsSource="{Binding Path=Nodes}">
    <Grid Margin="2">

        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="Auto"/>
        </Grid.ColumnDefinitions>

        <Image Source="/FMG.UI.WPF.Shared;component/Media/Images/job_72.png"
                Grid.Column="0"
				Height="16"
				Width="16"
                Margin="0,0,3,0"/>

        <TextBlock Grid.Column="1">
            <Hyperlink NavigateUri="{Binding Caption}"
                        Foreground="#0C2DAA"
                        Style="{StaticResource linkStyle}"
                        CommandParameter="{Binding}"
                        Command="{Binding Path=DataContext.SelectedNodeCommand,
                                RelativeSource={RelativeSource FindAncestor, 
                                AncestorType={ x:Type views:JobListView}}}">

                <InlineUIContainer>
                    <TextBlock Text="{Binding Caption}" 
                                FontSize="12"/>
                </InlineUIContainer>

            </Hyperlink>
        </TextBlock>
    </Grid>
</HierarchicalDataTemplate>

<StackPanel>
  <TextBox Text="{Binding MyViewModelList[0]}">
  <TextBox Text="{Binding MyViewModelList[1]}">
  <TextBox Text="{Binding MyViewModelList[2]}">
</StackPanel>

private List<string> _myViewModelList;
       public List<string> MyViewModelList
       {
           get
           {
               return _myViewModelList;
           }
           set
           {
               if (_myViewModelList != value)
               {
                   _myViewModelList = value;
                   RaisePropertyChanged("MyViewModelList");
               }
           }
       }

       private string MouseDown()
       {
           string finalString = "";
           foreach (string str in MyViewModelList)
           {
               finalString += str +", ";
           }
           return finalString;
       }

Matt T Heffron

private const int NumberOfStrings = 3;  // use appropriate number (and better name), your code showed 3
public ViewModel()   // constructor
{
  MyViewModelList = new List<string>(NumberOfStrings);
  for (int i = 0; i < NumberOfStrings; ++i)
  {
    MyViewModelList[i] = string.Empty;
  }
}
public List<string> MyViewModelList { get; private set; }