Selection.FillStyleKeepFmt Property (Visio)
Applies a fill style to an object while preserving local formatting. Read/write.
Setting a style to a nonexistent style generates an error. Setting one type of style to another type (for example, setting the FillStyleKeepFmt property to a line style) does nothing. Setting one type of style to another type that has more than one set of attributes changes only the appropriate attributes (for example, setting the FillStyleKeepFmt property to a style that has line, text, and fill attributes changes only the fill attributes).
Beginning with Microsoft Visio 2002, setting FillStyleKeepFmt to an empty string ("") causes the master's style to be reapplied to the selection or shape. (Earlier versions generate a "no such style" exception.) If the selection or shape has no master, its style remains unchanged.