Hello Sasha Monastirsky,
Thank you for the question.
Generally, RadMaskedEditBox support Currentcy mode. Please refer to our Examples application under section Editors >> Masked Edit Box
to see it in action.
As to the KeyPress event that does not fire, this is a known issue and it will be addressed in one of our next releases. For the time being, you can subscribe to the KeyPress event of the RadTextBoxItem contained in RadMaskedEditBox:
sender, KeyPressEventArgs e)
I hope this helps. If you have additional questions, feel free to contact me.
the Telerik team