>Setting Desktop, either to .T. or .F., works perfectly.
>
>As the Desktop property is readonly, I cannot change its value inside the form's code. So I created a variable (bDeskTop) to set this property in the definition of the form, but whatever is the value of bDeskTop (.T. or .F.) it only works in the first invocation on the form. The next time it simply ignores the value.
>
>There is a way to workaround this situation?
>

> bDeskTop = .F.
>
> oMyForm  = CreateObj ("frmMyForm") && The form will be created inside _Screen.
> oMyForm.Show ()
>
> Clear Events
>
> bDeskTop = .T.
>
> oMyForm  = CreateObj ("frmMyForm")  && It doesn't change, the form is created inside _Screen again.
> oMyForm.Show ()
>
> Clear Events
>
> Define Class frmMyForm as Form
>         . . . 
>        Desktop = bDeskTop
>         . . . 
> EndDefine
>

The reason it doesn't work the second time is that the form's definition is cached in memory ( to speed up) and it uses the first definition

Maybe before the second invocation

clear class frmMyForm  && see help

But the wisest would be to subclass frmMyForm, then instantiate either one of the classes

 Define Class frmMyForm as Form
         . . . 
        Desktop = .f.
         . . . 
 EndDefine

 Define Class frmMyFormDesktop  as frmMyForm 
         . . . 
        Desktop = .t.
         . . . 
 EndDefine