>According to HELP "You cannot change the WindowType setting once the window has been displayed.". Strange but sometimes some of my forms are displayed in Init Event (even not complete all the code in it). I can't find the reason yet. Try
>

>LPARAMETERS lpnDataSessionId, lpnWindowtype, lpnApr_id
>WITH thisform
>	IF VARTYPE(m.lpnWindowtype)="N" AND ;
>           INLIST(m.lpnWindowtype,0,1)  AND ;
>           .WindowType # m.lpnWindowtype ;
>           .Hide()
>           .WindowType = m.lpnWindowtype
>           .Show()
>	ENDIF
>ENDWITH
>

I've changed the Visible property default value to .f. instead (from Property Window) because I don't want my form to show up at this point of code yet. Init seems to call Show method internally, I don't even have to set visible to .t. init.