ulItemId (ULONG)

Item information.

This value depends on the VMA_* attribute set for the message.

• If the VMA_ITEMSIZE attribute is specified, the ulItemId field is as follows:

  usItemWidth (USHORT)

  Width to be set for each value set item, in pixels. The number of pixels specified cannot be less than 2.
  usItemHeight (USHORT)
  Height to be set for each value set item, in pixels. The number of pixels specified cannot be less than 2.
  
  If the VMA_ITEMSPACING attribute is specified, ulItemId field is as follows:

  usHorzItemSpacing (USHORT)

  Amount of horizontal space to be set between each value set item, in pixels. This number does not include the space needed for selected-state and target emphasis, and for the selection cursor, because the emphasis and cursor space is automatically set by the value set control. The default spacing is 0.
  usVertItemSpacing (USHORT)
  Amount of vertical space to be set between each value set item, in pixels. This number does not include the space needed for selected-state and target emphasis, and for the selection cursor, because the emphasis and cursor space is automatically set by the value set control. The default spacing is 0.

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