Vertical margin of an object. The top and bottom margins of the object, expressed in text columns.
An integer (1 to 999)
Indicates the unusable space immediately below the top edge and immediately above the bottom edge of the rectangle occupied by the object. For DisplayForms objects, this refers to the form object identified by the DisplayForms entry.
VMargin is set to 0 if both VMargin (character rows) and WdgVMargin (twips) are null.
HMargin, WdgHMargin, WdgVMargin