The Texture Address variable can be used to define the area that the NineSlice displays. By default the Texture Address is set to Entire Texture which means the NineSlice will display the entire source file (split up among the nine pieces).
The following screenshot shows an entire texture being used for a NineSlice.
The entire texture is split up into 3 sections horizontally and 3 sections vertically, matching up the texture coordinates used to display the NineSlice's 9 sections.
The Custom value allows specifying a custom set of coordinates for the Nine Slice. Custom is most often used to when an image is part of a sprite sheet. The following example uses this image:
The NineSlice uses the following variables:
Texture Address = Custom
Texture Top = 0
Texture Left = 0
Texture Height = 40
Texture Width = 40
These values result in the the following NineSlice:
