Just thought I would add a note because I have not been able to see this behaviour documented elsewhere.

When using


adding the text a_b changes to ab when navigated away from. The fix is to use MaskedText as the textmode instead which is the default so it would be
or simply

Hope this helps anyone else with the same issue

Hi Ross,

This behavior is expected. When you lost the focus from RadMaskedTextInput you see the value of its Text property. The way the Text property is set from the combination of the Value and the Mask properties is controlled by the TextMode property.

When the TextMode is set to Masked input the control's Text value represents the formatted Value including the placeholder characters. If the property is set to PlainText the Text contains the formatted Value but without the placeholder characters. The default placeholder of the masked input control is an underscore character (_).

Regards,
Martin
Telerik