Display a Status Bar
<Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="WPF" Height="150" Width="300"> <DockPanel LastChildFill="True"> <StatusBar DockPanel.Dock="Bottom"> <TextBlock Text="Font size: " /> <ComboBox Name="cbxFontSize" > <ComboBoxItem Content="12" IsSelected="True" Margin="2" /> <ComboBoxItem Content="14" Margin="2" /> <ComboBoxItem Content="16" Margin="2" /> </ComboBox> <Separator Margin="5"/> <RadioButton Command="EditingCommands.AlignLeft" CommandTarget="{Binding ElementName=rtbTextBox}" Content="Left" IsChecked="True"/> <RadioButton Command="EditingCommands.AlignCenter" CommandTarget="{Binding ElementName=rtbTextBox}" Content="Center" /> <RadioButton Command="EditingCommands.AlignRight" CommandTarget="{Binding ElementName=rtbTextBox}" Content="Right" /> </StatusBar> <RichTextBox Name="rtbTextBox"> <FlowDocument> <Paragraph FontSize="{Binding ElementName=cbxFontSize, Path=SelectedItem.Content}"> this is a test </Paragraph> </FlowDocument> </RichTextBox> </DockPanel> </Window>