The MirrorFill property returns or specifies whether the pattern tiles in a texture fill should be mirrored to conceal seams.
Examples:
The following VBA example applies a symmetrical texture fill to a rectangle.
Sub Test()
Dim s As Shape
Dim tf As TextureFill
Set s = ActiveLayer.CreateRectangle(0, 0, 4, 4)
Set tf = s.Fill.ApplyTextureFill("CMYK", "Samples 9")
tf.TileWidth = 2
tf.TileHeight = 2
tf.MirrorFill = True
End Sub