[]
Gets the "focus" rectangle for the center shade, specified relative to the fill tile rectangle.
The center shade fills the entire tile except the margins specified by each property.
Each edge of the center shade rectangle is defined by a percentage offset from the corresponding edge of the tile rectangle.
A positive percentage specifies an inset, while a negative percentage specifies an outset.
public EdgeExtent FillRectangle { get; }
Public ReadOnly Property FillRectangle As EdgeExtent
A left offset of 25% specifies that the left edge of the center shade rectangle is located to the right of the tile rectangle's left edge by an amount equal to 25% of the tile rectangle's width.