FontSize of RadRichTextBox not Respected

Updated on Aug 25, 2026

Environment

Product Version	2019.2.618
Product	RadRichTextBox for WPF

Description

The FontSize property of the RadRichTextBox is not applied to its text.

Solution

To display the proper FontSize passed to the RadRichTextBox control, you need to also set its DocumentInheritsDefaultStyleSettings property to True.

XAML

	<Grid>
		<telerik:RadRichTextBox x:Name="radRichTextBox" 
								DocumentInheritsDefaultStyleSettings="True" 
								FontSize="8" />
		<telerik:HtmlDataProvider 
								RichTextBox="{Binding ElementName=radRichTextBox}"  
								Html="{Binding Path=Html, Mode=TwoWay}" />
	</Grid>

See Also

• Frequently Asked Questions
• Data Providers