How to access a property from another class / control, from within a custom class?
===

I'm trying to replicate the messaging system of windows phones, but with another service.
I'm using the Chat Bubble control from the [Coding4Fun Toolkit for Windows Phone][1] to do this. 

(Screenshot of the Chat Bubble control):

![enter image description here][2]



The code I came up with below works fine, however the ChatBubbleDirection property within my datatemplate produces an error when it's databound. This is because I don't know how to use a property from another class (if this makes sense?). How would this be done? I just couldn't figure it out...

The XAML property should look like this:

    ChatBubbleDirection="LowerLeft"

As you can guess, this will determine the direction of the little arrow of the ChatBubble.

Here's the code for the message class:

    using Coding4Fun.Phone.Controls.Toolkit.Common;
    
    public class Message : Coding4Fun.Phone.Controls.ChatBubble
    {
        public string Text { get; set; }
        public string SendingDate { get; set; }
        //public Coding4Fun.Phone.Controls.ChatBubble { get; set; }
    }

And here's the code for the button click event:

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            LBmessages.ItemsSource = messages;
            Message m = new Message();
            m.SendingDate = "Today";
            m.Text = "This is a message";
            //m.direction = (Coding4Fun.Phone.Controls.ChatBubble).ChatBubbleDirectionProperty???
            messages.Add(m);
        }


And here's the XAML:

        <StackPanel x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <ScrollViewer Height="369" Name="scrollviewer1" Width="500">
                <ListBox Name="LBmessages" Height="250">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <Grid Width="456">
                                <cc:ChatBubble Width="500" Margin="0,0,0,20"  ChatBubbleDirection="{Binding direction}">
                                <Grid>
                                    <Grid.RowDefinitions>
                                        <RowDefinition Height="Auto"></RowDefinition>
                                        <RowDefinition Height="40"></RowDefinition>
                                    </Grid.RowDefinitions>
                                    <TextBlock Text="{Binding Text}" TextWrapping="Wrap" Width="430"></TextBlock>
                                    <TextBlock Grid.Row="1" HorizontalAlignment="Right" Text="{Binding SendingDate}"></TextBlock>
                                </Grid>
                            </cc:ChatBubble>
                        </Grid>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
           </ScrollViewer>
        </StackPanel>


  [1]: http://coding4fun.codeplex.com/
  [2]: http://i.stack.imgur.com/kqr4R.png


Does anybody have any idea what I should write in the Message class? I really don't know how to explain my problem any further. I have tried extending the ChatBubble class within my Message class (as you can see), but with no avail.

Thanks in advance for any help!