You need to use the starter window functions if you have pro.

Here is a sample one, unfortunately they are not documented .

One you have one in your code choose File/Starter to generate the proper code.

code:
  
WINDOW WINSTART
{
TITLE "Rock Hunter V 0.20";
SIZE 480,380;
MODE IMAGE;
BG_COLOR RGB(0, 0, 0);
SET FONT "ARIAL", RGB (255, 255, 255);
FRAME FTYP1, 0,0, 480, 380;
TEXT "Copyright 2002 - Giganti Games", 160, 10;
PICTURE <logo.pcx> ,OPAQUE , 44 , 32;
TEXT_STDOUT "ARIAL", RGB (255, 255, 255), 4, 170, 476, 184;
BUTTON BUTTON_QUIT,SYS_DEFAULT,"Abort", 398, 356, 70,20;
PROGRESS RGB (225, 0, 38), 60, 90, 356, 300, 20;
}