Is it possible on a windows phone to exclude something from the keyboard? I want to exclude the "," and keep only the "." character on the keyboard with InputScope="Number".
You cannot remove individual keys from the built in keyboard, only use one of the valid values for InputScope.
Instead you should validate the value (after all, , is the thousands separator in most cultures where . is the decimal separator (and vice versa in some)) for characters you don't want for your purpose, or do what some apps have done, and implemented a keypad with just the buttons you want as a control for use in your views.