The MaskedTextInput Value is bound to a property whose value is modified in its setter.
 In this case the Value of the control isn't updated to the modified value of the business property.
Also if Binding Converter changes the Value, it is not updated too.
Other maskedInput controls - Numeric, Currency work in such scenarios.

Possibility to enter numbers with non-fixed number of digits after the decimal separator.
The SDK sample DynamicFormatString demonstrates such behavior.

Here is a link to it = > https://github.com/telerik/xaml-sdk/tree/master/MaskedInput/DynamicFormatString

We are marking this feature request as Declined - we won't introduce built-in logic for it. 

MaskedInput: The cursor of the Mouse is  Caret when it is over the built in ScrollViewer
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Reason for deletion: The bug is logged for RadMaskedTextBox and it will be removed from our suite from Q2 2014.

Support entering a single digit in a DateTimeMaskedInput control with Mask="MM"

Supporting DateTimeOffset for DateTime masks

Add built in masks for Email, IP, Phone, etc. Add design time support for this.