Access to PreviewKeyDown event of richTextBox in userControl - wpf

Question

I would like to know how can I get access to event PreviewKeyDown of RichTextBox in UserControl.
For example, I have user Control and in this user control I have only one richTextBox:
Something like this:
<UserControl x:Class="Spirit.Controls.RichTextBoxControl"
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"
xmlns:toolkit="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit.Extended"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
<toolkit:RichTextBox Name="RichTextBox"
Grid.Row="0" PreviewKeyDown="?">
</toolkit:RichTextBox>
</Grid>
</UserControl>
I use this control in WPF window.
<Window x:Class="WpfApplication2.Window2"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Controls="clr-namespace:WpfApplication2.Controls" xmlns:WpfApplication2="clr-namespace:WpfApplication2" Title="Window2" Height="300" Width="300">
<Grid>
<Spirit.Controls:RichTextBoxControl Background="Red"
FontSize="13"
Margin="4,4,4,4"
Grid.Row="0"
Here I would like to acces to PreviewKeyDown of richTextBox/>
</Grid>
</Window>
I would like have access to PreviewKeyDown of richTextBox, bind some method on this event and have access to KeyEventArgs.
Something like this:
private void RichTextBoxInUserControl_PreviewKeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Enter )
{
//...
}
}

Answer 1

I noticed the Intellisence wasn't picking up on RichTextBox... in Window but you can subscribe to that event like this
<Spirit.Controls:RichTextBoxControl
Name="RichTextBoxInUserControl"
Background="Red"
FontSize="13"
Margin="4,4,4,4"
Grid.Row="0"
RichTextBox.PreviewKeyDown="RichTextBoxInUserControl_PreviewKeyDown"/>
where RichTextBox is the Name of the toolkit:RichTextBox specified in your UserControl