v4.0
Returns or sets a Long value
representing the width of the label of a control, in terms of its
percentage of the control's total width. When not specified
Softimage uses its own heuristic, but this can be useful to give a
hint when tweaking the layout. For example this can be useful to
force a long label onto multiple lines rather than squish the
controls.
To completely hide a label use the siUINoLabel or siValueOnly UI
Attribute (see siPPGItemAttribute).
This property should always be used in conjunction with PPGItem.LabelMinPixels.