attach
Adds a widget to the grid.
The position of @child is determined by @column and @row. The number of “cells” that @child will occupy is determined by @width and @height.
Parameters
child
the widget to add
column
the column number to attach the left side of @child to
row
the row number to attach the top side of @child to
width
the number of columns that @child will span
height
the number of rows that @child will span