Anchors are of type FRAMEPOINT, which has the following enumeration:

• TOPLEFT
• TOPRIGHT
• BOTTOMLEFT
• BOTTOMRIGHT
• TOP
• BOTTOM
• LEFT
• RIGHT
• CENTER

They may be specified with an optional relativeTo <some other frame> and relativePoint <on that frame>.

In additon offsets can be defined from the anchor points.

These correspond to the Region widget.