| Changes the default letter background to the given texture. The asset name should match a texture containing two rows: one with 320x180 pixel letter background images, and one with 24x24 pixel button backgrounds shown behind attached items. The index is the sprite to use from those rows, starting at 0 for the first one. | | Changes the default letter background to the given texture. The asset name should match a texture containing two rows: one with 320x180 pixel letter background images, and one with 24x24 pixel button backgrounds shown behind attached items. The index is the sprite to use from those rows, starting at 0 for the first one. |