I was excited to get a new masking control, but this soon turned to disappointment. Our users have difficulty with these controls as they are not intuitive. They expect it to behave the same as if you were entering something into an Excel spreadsheet cell and I don't blame them. It's confusing to me as well. I've tried all kinds of variations of textmode, autofill properties, and InputBehavior to get a mask n5.2 to behave properly. Essentially I think it should behave just as a regular textbox while entering data and display according to the mask when viewing the data.