Commented Issue: Richtextbox language problem [19385]

Hello support,

I have a problem with the richtextbox-control and the language.
Maybe you can help me.

If I doesn't change the text the spellchecking is working, when I change the language. If I wirte after the text new text or I mark all text und write then new text. The language is not set properly for the text and the spellchecking doesn't work.

Greetings Gregor Glinka

Here's my XAML-Code:
<Grid>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>

<ComboBox Name="lg" Grid.Row="0">
<ComboBoxItem Selector.IsSelected="True">en-US</ComboBoxItem>
<ComboBoxItem>fr-FR</ComboBoxItem>
<ComboBoxItem>es-ES</ComboBoxItem>
<ComboBoxItem>de-DE</ComboBoxItem>
</ComboBox>

<TextBox Grid.Row="1" SpellCheck.IsEnabled="True"
Language="{Binding SelectedItem.Content, ElementName=lg, ConverterCulture=en-us}">
Hund dog perro chien
</TextBox>

<extToolkit:RichTextBox Grid.Row="2" SpellCheck.IsEnabled="True" Language="{Binding SelectedItem.Content, ElementName=lg, ConverterCulture=en-us}">
<extToolkit:RichTextBox.Text>Hund dog perro chien</extToolkit:RichTextBox.Text>
</extToolkit:RichTextBox>
</Grid>
Comments: ** Comment from web user: GregorGSH **

Hello support,

can you say, when this problem will be solved?

Greetings Gregor Glinka