Use MaskedTextInput in Silverlight and press (Ctrl + Shift + Z). This will produce unexpected symbol.
RadMaskedNumericInput or RadMaskedCurrencyInput with SpinMode set to PositionAndValue. Mask="" (no-mask). Increasing from 1 to more than 10 works as expected. However, decreasing the 2-digitvalue to Value lower than 10 is not possible if the caret is on the right of all digits. Icreasing and decreasing is done with Keyboard Up and Down Arrow Keys. Available in LIB version: 2015.3.1019
Value is aabbcc. Caret is between "a" and "b". Pressing 2 times b should move the caret between "b" and "c". Currently the caret does not move. Fix available in LIB Version 2016.1.404.