How to move or resize widgets in a grid?

[GaryBoone]

What is the right way to move or resize widgets laid out using a grid?

It appears that aWidget.width = 30 does change the width, but that appears to be a character width rather than in a unit of columns as used in the grid.set command that created it. It also then fixes the width to 30 and no longer resizes when the window resizes.