Hi Cetin and Mobeen,

I already do it in this way:

define class oMainForm as Form
  ShowWindow=2
  WindowType=0
  movable=0
  closable=0
  maxbutton=0
  minbutton=0
  caption=""
  TitleBar=0
  halfheightcaption=.F.
  borderstyle=2
  ...........
enddefine

in this As-top level form, I'll also call some In-top level form on it. All those In-top level form can be set to Titlebar=0, but only for this main form, with above settings, it still have a Titlebar which is blue in color, have no text nor buttons on it, a plain blue Titlebar :-(

Even in the sample MSDN Solution Sample, I dont see any As-top level form with Titlebar=0 is defined..

Thanks for your help!