Selection.TextStyle Property (Visio)
Gets or sets the text style for an object. Read/write.
Setting a style to a nonexistent style generates an error. Setting one kind of style to an existing style of another kind (for example, setting the TextStyle property to a fill style) does nothing. Setting one kind of style to an existing style that has more than one set of attributes changes only the attributes for that component (for example, setting the TextStyle property to a style that has line, text, and fill attributes changes only the text attributes).
To preserve a shape's local formatting, use the TextStyleKeepFmt property.
Beginning with Visio 2002, setting TextStyle to an empty string ("") will cause 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.