packStart
Adds @renderer to @box, packed with reference to the start of @box.
The @renderer is packed after any other GtkCellRenderer packed with reference to the start of @box.
Parameters
renderer
the GtkCellRenderer to add
expand
whether @renderer should receive extra space when the area receives more than its natural size
align
whether @renderer should be aligned in adjacent rows
fixed
whether @renderer should have the same size in all rows