Two new AUI_CONTROL CSTATE flags, MBST_ZTOP (&H200000) and MBST_ZBOTTOM (&h400000) may be set to force the control to be at the top or bottom, respectively, of the "Z-order". (The "Z-order" determines the display order of controls that otherwise have the same precedence. In general, controls created later are farther down the Z-order than controls created earlier. These flags would mainly be of use in situations where you have overlapping sibling controls.)
