| position | Rectangle on the screen to use for the group. |
| text | Text to display on the group. |
| image | Texture to display on the group. |
| content | Text, image and tooltip for this group. If supplied, any mouse clicks are "captured" by the group and not If left out, no background is rendered, and mouse clicks are passed. |
| style | The style to use for the background. |
Create a new GroupScope and begin the corresponding group.