ChatControl.xaml

<UserControl x:Class="Torch.Server.ChatControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <ScrollViewer x:Name="ChatScroller"  Grid.Row="0"  Margin="5,5,5,5" HorizontalScrollBarVisibility="Disabled">
            <RichTextBox x:Name="ChatItems" IsReadOnly="True" BorderThickness="0" Background="Transparent" VerticalScrollBarVisibility="Hidden" />
        </ScrollViewer>
        <Grid Grid.Row="1">
            <Grid.ColumnDefinitions>
                <ColumnDefinition/>
                <ColumnDefinition Width="Auto"/>
            </Grid.ColumnDefinitions>
            <Button Grid.Column="1" Content="Send" DockPanel.Dock="Right" Width="50" Margin="5" Click="SendButton_Click"></Button>
            <TextBox Grid.Column="0" x:Name="Message" Margin="5" KeyDown="Message_OnKeyDown"></TextBox>
        </Grid>
    </Grid>
</UserControl>