Chr() - Very weird [Resolved]

[UTGrim]

I'm making a calculator that receives input through the form's KeyUp event. I created a Select Case to know what characters were input like this:

Private Sub Form_KeyUp(KeyCode As Integer, Shift As Integer)
Select Case Chr(KeyCode)
    Case "0"

This works fine when I type with the numbers on top of the letter keys, but when I use the numbers to the right of the keyboard, Chr() returns some weird characters, like 96 (`).

How can I know what characters were typed down for real?

Thank you.