I have a textbox which Text property is bound like that

```
   <TextBox Name="txtBox">
        <TextBox.Text>
            <Binding Path="Data">

            </Binding>
        </TextBox.Text>
    </TextBox>

```

The filed Data can be changed in various places in my program. However if I change filed Data in ahother control, the t txtBox Text property does't refresh itself. I still can see the old value(despite the fact that Data filed has been changed).
Is there any way to force textbox to refresh itselft or sth?