Setting Up Gadget Docking: <fgdock>

The DOCK attribute allows you to dock a gadget to the left, right, top, or bottom edge of its container, typically a form or a frame; or you can cause the gadget to dock to all edges, or to no edges.

>-- <fgdock> -----------+-- DOCK ----+-----Left ----.

+---- Right ‑--|

+---- Top -----|

+---- Bottom ‑-|

+---- None --‑-|

‘---- Fill --‑-’-->

Note:
The DOCK and ANCHOR attributes are mutually exclusive.
Setting the DOCK attribute resets the ANCHOR to the default; setting the ANCHOR attribute resets DOCK to none.
Set these attributes only when the gadget is defined. It cannot be changed after exiting from setup. The resize behavior at run-time is not allowed.