Most gadgets have the ANCHOR attribute and a few have the DOCK attribute which allow the user to define gadgets that have intelligent positioning and resizing behaviour when their container gadget resizes.

This allows you to have more than one resizable gadget on a form and still have predictable and potentially complex resize behaviour. An example of an intelligent resizable form is given in Complex Form Layout.

However, 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.

ALPHA and VIEW gadgets do not support DOCK or ANCHOR attributes. They do, however, expand to fill their containers, so you can put them in a frame and set the frame’s DOCK or ANCHOR attributes to get the behaviour you want.