Focus first input in header grid

Hello,

I want to focus the first input in the header of my grid, but it doesn't work, I try to do it to a AW.UI.Input which is not in the header and it's work. what is the difference ?

the javascript code :

function setFocus(value)

   {

        document.getElementById(value).focus();

   }

And html code :
<body onload="setFocus('myGrid-header-2-1-box-text');">

If Someone could help me.

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