====== Group window ======
This window can be used to group objects in a way that you can further control them, as in for example building a room and grouping all the room components in a group called "room". 

An object can belong to only one group at a time. Initially, all objects belong to the "None" group, which is a default dummy one.

{{group01.jpg|}}

The window has a menu bar and several inputs:
  * **Menu**:
    * **New**: creates a new group, adding the current selection to it if not empty.
    * **Delete**: deletes a selected group.
    * **Add Selected Objects**: will add the current selection to the selected group.
    * **Remove Selected Objects**: will remove the currently selected objects from the selected group.
    * **Select Objects in Group**: will select all the objects in the selected group.
    * **Deselect Objects in Group**: will deselect all the objects in the selected group.
  * **A Group list**: this ListBox will display the names of every created group. Note that the "None" group is a default one and will always be shown.
  * **An object list**: will show all objects belonging to a group selected in the list mentioned above.
  * **Name input**: its use is to rename groups. Note that the "None" group is a default one and cannot be renamed.
  * **Visible**: this will set objects in a group as visible or not.