Telerik Scheduler Validations
===

I am working on integrating Telerik Scheduler control for WPF i.e. my application is being developed in WPF. During appointment creation, the control provides a window where all the details about the appointment will be inputted by the user. Suppose, a user has clicked OK button without entering any data, here, I want to display a dialog box which will ask him to enter the information in the corresponding controls on the form or i want to specify the validations to the controls asking for data from user. I am not sure how to implement this functionality in the telerik. 

Can anyone suggest something? Any pointers will be really appreciated.........