Contains the description of a Gui layout group - that is, a collection of controls whose interfaces should display based on a value condition or a rollout button. If a property is to be a member of the group, it should be linked to by the GuiHints group property. Groups can be linked to other groups, in which case they are sub-groups.
Condition under which this group should be visible (e.g. Property.Value true)
OR, caption to display on a button to allow manual visibilty control.
The GuiGroupHint this group is a sub-group of.
Whether the group is initially expanded (will be overriden if there is a condition)
Whether to increment the indent level for the group's members.
The name of a custom type registered with GUIBuilder.