gtkBoxPackStart: gtkBoxPackStart
In RGtk2: R Bindings for Gtk 2.8.0 and Above

Adds child to box, packed with reference to the start of box. The child is packed after any other child packed with reference to the start of box.

1	gtkBoxPackStart(object, child, expand = TRUE, fill = TRUE, padding = 0)

`object`	a `GtkBox`
`child`	the `GtkWidget` to be added to `box`
`expand`	`TRUE` if the new child is to be given extra space allocated to `box`. The extra space will be divided evenly between all children of `box` that use this option
`fill`	`TRUE` if space given to `child` by the `expand` option is actually allocated to `child`, rather than just padding it. This parameter has no effect if `expand` is set to `FALSE`. A child is always allocated the full height of a `GtkHBox` and the full width of a `GtkVBox`. This option affects the other dimension
`padding`	extra space in pixels to put between this child and its neighbors, over and above the global amount specified by `"spacing"` property. If `child` is a widget at one of the reference ends of `box`, then `padding` pixels are also put between `child` and the reference edge of `box`