#define SIZEPOLICY_STRETCH_TOP 0x08
#define SIZEPOLICY_STRETCH_BOTTOM 0x09
#define SIZEPOLICY_UNCONSTRAINED 0x10
+#define SIZEPOLICY_VISIBILITY_CONSTRAINED 0x11
#define SIZEPOLICY_GRAVITY_NORTHWEST (SIZEPOLICY_GRAVITY|SIZEPOLICY_VERT_TOP|SIZEPOLICY_HORIZ_LEFT)
#define SIZEPOLICY_GRAVITY_NORTH (SIZEPOLICY_GRAVITY|SIZEPOLICY_VERT_TOP|SIZEPOLICY_HORIZ_CENTER)