setData() after instanceReady event doesnt work

Hello,

i have a problem regarding the instanceReady event. I would like to set the CKEditor data after creating an instance with CKEDITOR.replace("textarea");

With my code

CKEDITOR.on("instanceReady", function(event)
{
        event.editor.setData("test");
});

i get a white editing box of my CKE instance. There is no data at all, even no data of the textarea. If i reload the page (F5) the setData() function works. I don´t understand that behaviour. For me it seems, that the editor object is not propery loaded at the first time. If i add an

alert("xxxx");

before the setData() function the code is working well.

Does anybody have a good solution for that issue? You would help me a lot - i don´t want to spend my time on hours of trial and error and perhaps the solution is realy easy, but i don´t see it properly!

Thank you in advance,
Alex

Another (not working) aproach was:

CKEDITOR.on("instanceReady", function(event)
                 {
                    FoswikiCKE.instanceLoaded = false;
                    
                    editor = event.editor;
                    editor.on("dataReady", function(event)
                    {
                       if (FoswikiCKE.instanceLoaded == false)
                       {
                          event.editor.setData('Hallo');
                          FoswikiCKE.instanceLoaded = true;
                       }
                    });
});