Setting the spin control range does not seem to work for me as
?SpinControl{Prop:RangeLow} = CurrentSpinValue
?SpinControl{Prop:RangeHigh} = CurrentSpinValue
I would make it simpler by disabling the control ?SpinControl{Propisable} = TRUE
Using PROPisable is the better approach. Another way is use hide/unhide a REGION control over the spin box to allow/disallow entry. The advantage of the REGION approach is that the control's appearance does not change i.e. greyed out when disabled.
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