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USAGE:
   DEFINE DIALOG oDlg.....
     REDEFINE IMAGE | BITMAP  oImg OF oDlg ADJUST .....
   ACTIVATE DIALOG oDlg ON INIT SetAspectRatio(oImg)

or
   REDEFINE .....
   ON CHANGE 
       (cBmpFile:=....,;
        ( oImg:LoadImage(,cBmpFile)
          SetAspectRatio(oImg))


NOTES: It could be added as a method to tBitmap class: oImg:SetAspectRatio(lKeepAspect)
Tested with FWH803-xHb1B,BCC55

   
FUNCTION SetAspectRatio(oImg)
  
  Local nImgWidth, nImgHeight
  Local nCtrlWidth, nCtrlHeight
  Local y1,x1,y2,x2,dx,dy

  WITH OBJECT  oImg
    :Hide()
    IF Empty(:Cargo)
      WITH OBJECT :tControl()
        :Cargo:={:nTop,:nLeft,:nWidth,:nHeight}
        //use Cargo to store init control position and dims. if added as 
        // method, we can use a new data to store them
      END
    ELSE
      :Move(:Cargo[1],:Cargo[2],:Cargo[3],Cargo[4])
       //always resize to original pos before changing image  
    ENDIF
    nImgWidth:=:nWidth
    nImgHeight:=:nHeight
    WITH OBJECT :tControl()
      y1:=:nTop; x1:=:nLeft
      y2:=y1+:nHeight-1; x2:=x1+:nWidth-1
    END
    nCtrlWidth:=x2-x1+1
    nCtrlHeight:=y2-y1+1
    ImgAdj(nImgWidth,nImgHeight,nCtrlWidth,nCtrlHeight,@dx,@dy)
    x1:=x1+(x2-x1-dx)/2; y1:=y1
    :Move(y1,x1,dx,dy)
    :Show()
  END
return nil

STATIC Function ImgAdj(dx1,dy1,dx2,dy2,dx,dy)
//Get new control dimensions dx,dy to assure aspect ratio is kept.
  Local l:=dy1/dx1
  //dx2+=8; dy2+=8
  IF dy2/dx2<l
    dy=dy2; dx:=dy/l
  ELSE
    dx:=dy2; dy:=l*dx
  ENDIF
  IF dx>dx2
    dx:=dx2; dy:=l*dx
  ENDIF
  IF dy>dy2
    dy:=dy2; dx:=dy/l
  ENDIF
  dx:=Int(dx); dy:=Int(dy)
return nil