I found the solution on how to make a PPC aplication run in fullscreen and i am posting it, cause i didn't find any 100% correct solution on the forum.
1) In your project include the windows unit (uses windows;)
2) Add the following code:
interface
const
//ShFullScreen
SHFS_SHOWTASKBAR = $01;
SHFS_HIDETASKBAR = $02;
SHFS_SHOWSIPBUTTON = $04;
SHFS_HIDESIPBUTTON = $08;
SHFS_SHOWSTARTICON = $10;
SHFS_HIDESTARTICON = $20;
function SHFullScreen(hwndRequester: hWnd; dwState: DWord): WINBOOL;
stdcall; external 'aygshell.dll' name 'SHFullScreen';
3) Finally at your forms create event add the following code:
procedure TForm1.FormCreate(Sender: TObject);
var
rect:trect;
htaskbar:thandle;
menuh:integer;
begin
hTaskBar := findwindow('HHTaskBar','');
GetWindowRect(htaskbar,rect);
menuh:=rect.Bottom-rect.Top;
GetWindowRect(form1.handle,rect);
SHFullScreen(form1.handle,SHFS_HIDETASKBAR or SHFS_HIDESTARTICON or SHFS_HIDESIPBUTTON);
movewindow(form1.handle,rect.left,rect.Top-menuh,rect.Right,rect.bottom+menuh,true);
end;
The End!