| xalign : | the horizontal alignment of the child widget, from 0 (left) to 1 (right). |
| yalign : | the vertical alignment of the child widget, from 0 (top) to 1 (bottom). |
| xscale : | the amount that the child widget expands horizontally to fill up unused space, from 0 to 1. A value of 0 indicates that the child widget should never expand. A value of 1 indicates that the child widget will expand to fill all of the space allocated for the GTK2.Alignment. |
| yscale : | the amount that the child widget expands vertically to fill up unused space, from 0 to 1. The values are similar to xscale. |