| Idx_BGTexture | link - The texture to display on the background |
| Idx_BGTextureRect | vec4f - Section of the texture to be used, specified in normalised UV coordinates |
| Idx_BGTextureRot | float - Rotation of the texture (degrees) |
| Idx_CornerSize | vec2f - Size of the corners in panel units |
| Idx_CornerTextureSize | vec2f - Size of the corner graphics in the texture, in UV coordinates |
| Idx_TextSize | float - Scalar applied to text to control its size |
| Idx_TextColour | vec4f - Text colour; RGBA 0.0f to 1.0f |
| Idx_Font | link - Font to use to display the text (Meta_Font) |
| Idx_TextPadding | vec2f - Padding around text |
| Idx_HAlign | HAlign (int) - How to align the objects horizontally |
| Idx_VAlign | VAlign (int) - How to align the objects vertically |
| Idx_Borders | vec2f - Padding around the edge of the button |
| Idx_HighlightColour | The background colour for highlighted text, used in TextBox only. |