ButtonBox.setChildSecondary

Sets whether child should appear in a secondary group of children. A typical use of a secondary child is the help button in a dialog.

This group appears after the other children if the style is [gtk.types.ButtonBoxStyle.Start], [gtk.types.ButtonBoxStyle.Spread] or [gtk.types.ButtonBoxStyle.Edge], and before the other children if the style is [gtk.types.ButtonBoxStyle.End]. For horizontal button boxes, the definition of before/after depends on direction of the widget (see [gtk.widget.Widget.setDirection]). If the style is [gtk.types.ButtonBoxStyle.Start] or [gtk.types.ButtonBoxStyle.End], then the secondary children are aligned at the other end of the button box from the main children. For the other styles, they appear immediately next to the main children.