RadMaskedTextInput with no-mask => Mask="". Selecting part of the value then paste works incorrectly. The selected text is not replaced and it is preserved, the copied text is inserted. It is expected that the selected text is entirely replaced with the copied text.
The bug will be resolved in Q2 2014 SP till the end of July. Cut will leave underscores in Masked scenarion - when the mask is "a5", "a10", "#20" and this i by design. If you need cut to act just like in normal textbox - you will need to use no-mask (Mask="")
Agree, there are alot of Copy/Paste issues, This also effects Cut leaving underscores after cutting a text out of the box etc etc. Annoying things, have to be fixed asap.
Why should we vote to get this fixed?? It's a bug in the only text-control in your library. There are no alternatives to a text- control in your library, and copy-paste is a standard operation in windows. This control really need some developer-love. So just go fix it!!!