A String expression that indicates the Key of the FormatAppearance object to be
removed.
The Remove method removes a FormatAppearance object giving
its key. The Clear method removes
all elements in the FormatAppearances collection. Excludes the
exPivotBarAllowFormatAppearance flag from the PivotBarVisible
property, and so no FormatAppearance objects are displayed on the control's
context menu. Use the Add method to add
a new FormatAppearance object. You can use the for each statement to enumerate all objects
in the FormatAppearances collection.