Error while converting feild to Link button to CRM Form 2013 online

function ConvertToLink(fldName) {

    var btn = "<a href='BLOCKED SCRIPT void(0);' onclick=\"window.open(\'http://www.google.com\', \'windowname1\', \'width=600, height=650\');  return false;\" style='color:blue;text-decoration:underline !important'>Test Account</a>";

    var ctrl = Xrm.Page.ui.controls.get(fldName)._control;

alert(ctrl);

    // Add the new button 

    //ctrl.get_element().innerHTML += btn;

    // Hide the textbox 

    ctrl.get_element().firstChild.style.display = 'none';

}

when i alert the "ctrl" i get Error "undefined".

I think the problem is at .controls.get(fldName)._control;

Please help!

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