Units
of measurement.
Unit or units of measurement that are to be set for the value set control.
This can be either of the following:
VMA_ITEMSIZE
If this message attribute is set,
the width and height of each item is set using the values of the usItemWidth
and usItemHeight parameters, respectively.
VMA_ITEMSPACING
If this message attribute is set, the horizontal
and vertical spacing between each item is set using the values of the usHorzItemSpacing
and usVertItemSpacing parameters, respectively.
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