Validation Messages and Usability
Good validation messages help users complete the forms faster and without any error in the specified data. Users get to see error messages for various types of controls and panes.
If you configure validation messages for each control, the user gets the validation message for the control after specifying data and moving on to the next control. If you configure the validation to occur on submitting the form, the validation message appears after the user clicks Submit to submit the form.
Clicking the message associated with an individual control sets the focus on that control. Record and Grid panes automatically navigate to the correct page in order to show the invalid control. If you configure validation for the entire pane, the focus of the screen shifts to the beginning of the pane in case of a failed validation.
For information about invoking validations programmatically, see validate in the API reference.