Richtextbox mouse pointer

[sanjay]

Hi

i have issue in  RichTextBox. i will add Text (DisplayMsg) . after go on  adding text to RichTextBox  scroll bar comes. At that time mouse pointer is not showing default pointer.Please help me out
 

<RichTextBox Margin="38,18,276,257">
                           <Paragraph>
                               <Run Text="{Binding DisplayMsg,Mode=TwoWay}"></Run>
                           </Paragraph>

                       </RichTextBox>

Regards
Sanjay