Can't keep button centered on window size change

[Gintaras]

DT_AutoSizeControls does not make controls centered.

Function dlg_control_centered

Code:

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\Dialog_Editor
function# hDlg message wParam lParam
if(hDlg) goto messages

if(!ShowDialog("dlg_control_centered" &dlg_control_centered 0)) ret

;BEGIN DIALOG
;0 "" 0x90CF0AC8 0x0 0 0 217 129 "Dialog"
;3 Button 0x54032000 0x0 82 54 50 16 "Button"
;END DIALOG
;DIALOG EDITOR: "" 0x2030300 "*" "" ""

ret
;messages
sel message
,case WM_INITDIALOG
,SendMessage hDlg WM_SIZE 0 0
,
,case WM_SIZE
,int c=id(3 hDlg)
,RECT rd rc
,GetClientRect hDlg &rd
,GetClientRect c &rc
,mov rd.right/2-(rc.right/2) rd.bottom/2-(rc.bottom/2) c
,
,case WM_COMMAND goto messages2
ret
;messages2
sel wParam
,case IDOK
,case IDCANCEL
ret 1