Browser popup window maximize button is in enable state in Chrome browser

Hi Friend,

              I used javascript code to open popup window.Popup window "Maximize" button is in 

disable state.But in Chrome it is in enable state.I want to make browser maximize button disable.

So please help me..

Below is my javascript code

function Call_PopUp(event, URL) {
window.open(URL, 'CustomPopUp', 'width=990, height=540, menubar=no,scrollbars =yes, resizable=no, top=50,left=50,toolbar=no,dialog=yes,minimizable=yes,maximizable=no');
}