Olá!
Veja em hwgui\include\guilib.ch as constantes manifestas que definem os tipos de ancoragem:
#define ANCHOR_TOPLEFT 0 // Anchors control to the top and left borders of the container and does not change
// the distance between the top and left borders. (Default)
#define ANCHOR_TOPABS 1 // Anchors control to top border of container and does not change the distance between
// the top border.
#define ANCHOR_LEFTABS 2 // Anchors control to left border of container and does not change the distance between
// the left border.
#define ANCHOR_BOTTOMABS 4 // Anchors control to bottom border of container and does not change the distance between
// the bottom border.
#define ANCHOR_RIGHTABS 8 // Anchors control to right border of container and does not change the distance between
// the right border.
#define ANCHOR_TOPREL 16 // Anchors control to top border of container and maintains relative distance between
// the top border.
#define ANCHOR_LEFTREL 32 // Anchors control to left border of container and maintains relative distance between
// the left border.
#define ANCHOR_BOTTOMREL 64 // Anchors control to bottom border of container and maintains relative distance between
// the bottom border.
#define ANCHOR_RIGHTREL 128 // Anchors control to right border of container and maintains relative distance between
// the right border.
#define ANCHOR_HORFIX 256 // Anchors center of control relative to left and right borders
// but remains fixed in size.
#define ANCHOR_VERTFIX 512 // Anchors center of control relative to top and bottom borders but remains fixed in size.
Voce pode combinar os efeitos
Exemplo:
Se voce quer manter uma toolbar ocupando toda a largura do FORM ao maximizar ele USE anchor = 11 ( 11 ==> ANCHOR_TOPLEFT + ANCHOR_TOPABS + ANCHOR_LEFTABS + ANCHOR_RIGHTABS )
Se voce quer manter um botão sempre do lado direito do form mantendo sempre a mesma distancia da borda direita use anchor = 9
Luis Fernando Basso
Fonte: extraÃdo do link postado anteriormente
HwGUI Anchor