Unity - Scripting API:

public GUI.GroupScope(position: Rect)

public GUI.GroupScope(position: Rect, text: string)

public GUI.GroupScope(position: Rect, image: Texture)

public GUI.GroupScope(position: Rect, content: GUIContent)

public GUI.GroupScope(position: Rect, style: GUIStyle)

public GUI.GroupScope(position: Rect, text: string, style: GUIStyle)

public GUI.GroupScope(position: Rect, image: Texture, style: GUIStyle)

Parameters

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.