>Why is Value a string? It's a currency value. And SET POINT TO only specifies which value you SHOW as the decimal separator.

When you write a literal number/currency the decimal point is SET("POINT") or "." ?

try 20'' job:

on command;
 SET POINT TO "?"
- Form designer
- add a textbox
- select textbox
- on textbox gotfocus
WAIT WINDOW VARTYPE(THIS.Value)
on command:
ASELOBJ(ax)
ax[1].value=$1
? VARTYPE(ax[1].value) && print Y : this is the value of the instanced textbox

Now run
!!!! on the window message you see a C