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Hellau, Yep.. I "borrowed" this proc from Iczelion's Splash Screen tut once. Just call the procedure at WM_INITDIALOG with invoke CenterWindow,hWnd

CenterWindow proc hWnd:HWND

     LOCAL DlgHeight:DWORD
     LOCAL DlgWidth:DWORD
     LOCAL DlgRect:RECT
     LOCAL DesktopRect:RECT
     
          invoke GetWindowRect,hWnd,ADDR DlgRect
          invoke GetDesktopWindow
          mov ecx,eax
          invoke GetWindowRect,ecx,addr DesktopRect
          push 0
          mov eax,DlgRect.bottom
          sub eax,DlgRect.top
          mov DlgHeight,eax
          push eax
          mov eax,DlgRect.right
          sub eax,DlgRect.left
          mov DlgWidth,eax
          push eax
          mov eax,DesktopRect.bottom
          sub eax,DlgHeight
          shr eax,1
          push eax
          mov eax,DesktopRect.right
          sub eax,DlgWidth
          shr eax,1
          push eax
          push hWnd
          call MoveWindow
	  ret
CenterWindow endp

Hi, There is another way easier than the one (better I don't know, but easier & shorter): In the rc file, as style for the dialog, just simply add: DS_CENTER and your dialog will be centered. hope this will help you. Vom-bonjour:-()