The number of lines visible in a list box or combo box, or the number of visible lines in a multi-line entry field.
A non-negative integer
In a list box or in the list portion of a combo box, indicates how may items are visible at one time.
In a multi-line entry field, indicates how many lines of text are visible at one time.
If WdgNumVisibleLines is 2 or greater, WdgMultiLine must be set to 1.