A positive integer that determines how the spinbox's value will be displayed. The decimal point
in the spinbox's value gets shifted to the right, and this resource specifies the number of decimal
places to shift. For example, if the spinbox's value is 1234, then setting its XmNdecimalPoints
resource to 2 causes it to display 12.34.
If True, the number format will pad the display value with leading zeroes (and trailing zeroes,
if the value has decimal places). This can be useful for giving users visual cues on the expected
values for the spinbox.