don't need every possible widget in there I think
it provides an API to easily put things (other widgets) onto a layout in a grid format.
I don't think I need to put a wide variety of widgets in the grid. Text and check-boxes (and perhaps maybe pull-down lists) might be sufficient. Ideally the user could expand or shrink columns by dragging on the borders in the column headers. And of course have automatic scroll-bars.
Think of sort of a scaled-down spreadsheet (MS-Excel) in a fixed area or window without the "edit bar" (or optional edit bar) at top. Data entry would appear right inside cells next to the cursor.
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