[ADDITION] Added databinding to the chatbox function.

Tried to broadcast the message, doesn't work yet.

Client/Views/GameWindow.xaml

@@ -48,8 +48,13 @@
         </Border>
 
         <Grid Grid.Column="2" Grid.Row="1">
-            <TextBox Name="SentMessage" IsReadOnly="True" Margin="0,0,0,50"/>
-            <TextBox x:Name="ChatBox" Keyboard.KeyDown="ChatBox_KeyDown" Width="200" Height="50" ToolTip="Message goes here" ToolTipService.IsEnabled="True" VerticalAlignment="Bottom" HorizontalAlignment="Left"/>
+            <ListBox Name ="TextBox" ItemsSource="{Binding Path=Messages}" Margin="0,0,0,69"/>
+
+            <TextBox Name="ChatBox" Text="{Binding Message, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Margin="0,465,0,0">
+                <TextBox.InputBindings>
+                    <KeyBinding Key="Return" Command="{Binding OnKeyDown}"/>
+                </TextBox.InputBindings>
+            </TextBox>
         </Grid>
 
     </Grid>

Client/Views/GameWindow.xaml.cs

@@ -18,7 +18,7 @@ namespace Client.Views
     /// </summary>
     public partial class GameWindow : Window
     {
-        ClientData data = ClientData.Instance;
+       
         public GameWindow()
         {
             DataContext = new ViewModelGame();
@@ -82,7 +82,6 @@ namespace Client.Views
             //    var deepCopy = System.Windows.Markup.XamlReader.Parse(xaml) as UIElement;
             //    TEST.Children.Add(deepCopy);
             //}
-
         }
 
         private void ClrPcker_Background_SelectedColorChanged_1(object sender, RoutedPropertyChangedEventArgs<Color?> e)
@@ -95,23 +94,14 @@ namespace Client.Views
             color = colorSelected;
         }
 
-        private void ChatBox_KeyDown(object sender, KeyEventArgs e)
-        {
-            //if enter then clear textbox and send message.
-            if (e.Key.Equals(Key.Enter))
-            {
-                WriteToChat(ChatBox.Text);
-                ChatBox.Clear();
-            }
-        }
-
-        /*
-         * Writes the current client's message to the chatbox.
-         */
-        private void WriteToChat(string message)
-        {
-            string user = data.User.Username; 
-            SentMessage.AppendText($"{user}: {message}\n");
-        }
+        ///*
+        // * Writes the current client's message to the chatbox.
+        // */
+        //private void WriteToChat(string message)
+        //{
+        //    string user = data.User.Username;
+        //    SentMessage.AppendText($"{user}: {message}\n");
+        //    data.User.Message = message;
+        //}
     }
 }

Client/Views/MainWindow.xaml.cs

@@ -32,7 +32,6 @@ namespace Client
 
         private void Button_Click(object sender, RoutedEventArgs e)
         {
-
             Lobby lobbySelected = LobbyList.SelectedItem as Lobby;
             if(lobbySelected != null)
             {