The ToggleGroup to which this ToggleButton belongs. A ToggleButton can only be in one group at any one time. If the group is changed, then the button is removed from the old group prior to being added to the new group.

The typical usage scenario is:

                    Group {     var toggleGroup = ToggleGroup {};     content: [         ToggleButton {             text: "First"             toggleGroup: toggleGroup         },         ToggleButton {             text: "Second"             toggleGroup: toggleGroup         },         ToggleButton {             text: "Third"             toggleGroup: toggleGroup         }     ] } 
                

Indicates whether this Toggle is selected. This can be manipulated programmatically.