var onChosenFileToOpen = function(theFileEntry) {

$('.nav-tabs li:nth-child(' + $(".nav-tabs").children().length + ') a').click(); //synchronous function that creates a tab
var checker=setInterval(()=>{
  if(currentiframe.contentWindow && currentiframe.contentWindow.editor){//waits those 2 conditions to be true
    currentiframe.contentWindow.readFileIntoEditor(theFileEntry)//content is loaded to that tab
    clearInterval(checker)
  }

},1)};