TileSize sets the tiling size of the ImageButton. The default
UDim2 values are 1,0,1,0. The scale component of the UDim2 will scale the tile based on the size of the ImageButton. The offset is in raw pixels. The tiling starts at the upper left-hand corner of the image. For example a scale of 0.5 will mean the tile will be half the size of the ImageButton (in the corresponding axis).
This property is only active if the ScaleType for the ImageButton is set to Tile instead of Slice or Stretch.
Image ScaleType Demo
This code sample demonstrates the different ScaleType options - Stretch, Tile and Slice. It does this by resizing an ImageLabel/ImageButton in a circle.