The Texture Top variable controls the top pixel of the source rectangle used to draw the NineSlice. Texture Top is only available if the NineSlice uses a Texture Address of Custom or Dimension Based.
The following image shows a NineSlice with a Texture Top value of 48.
Texture Top controls the top side of the region that the NineSlice displays on its source file. In this case, the top-edge of the source rectangle is 48 pixels from the top edge of the entire file.
