Normally a gradient fill encompasses the entire bounding box of the object which contains the fill.

However, with the TileRectangle property, it is possible to define a "tile" rectangle which is smaller than the bounding box.

In this situation, the gradient fill is encompassed within the tile rectangle, and the tile rectangle is tiled across the bounding box to fill the entire area.

This property has effect if the Type property is GradientType.Rectangle or GradientType.Circle.