Thank you for your interest in Test Studio and I apologize for the delay in getting back to you on this.
Please refer to these articles in our online documentation regarding Verifications
and how they can be created using the Elements Explorer
Once your test reaches a point where this expected change has been saved to the application, I suggest that you implement a Wait
for verification step on the target element containing the value in question (eg. Wait for 'TextContent' contains '12' on 'ElementTextBox').
Please let me know whether my suggestion helps.
the Telerik team