gtk:frame-label-xalign (object)

object -- a gtk:frame widget
xalign -- a number coerced to a single float for the position of the label along the top edge of the widget

The accessor for the label-xalign slot gets or sets the x alignment of the label of the frame. The default value for a newly created frame is 0.0. A value of 0.0 represents left alignment, 1.0 represents right alignment. The change of the property is ignored if the value is not in the range of [0.0, 1.0].