Adds/Removes the specified Frame. Remove - Set the Remove property to True if you wish to remove the specified FrameIndex, ...

Adds/Removes the specified Frame.

Remove     - Set the Remove property to True if you wish to remove the
             specified FrameIndex, otherwise False [the default] to Insert the
             ImageFile before the specified FrameIndex
ImageFile  - Set the ImageFile property to the ImageFile object whose
             ActiveFrame that you wish to add (ignored for Remove)
FrameIndex - For Remove, set the FrameIndex property to the index of the frame
             you wish to remove, otherwise for add, set the FrameIndex to the
             index of the frame to insert the ImageFile before, otherwise 0
             [the default] to append a frame from the ImageFile specified