Visibility: hidden and display: none

Hello,

I'm using CKEditor with .NET

I asign CKEditor.Text = "sdlfasfjaslñj";

But it's not shown. I've researched HTML generated and I've seen these attributes:

<textarea name="ucEditerEmail1$FCKeditor1" id="ucEditerEmail1_FCKeditor1" style="width: 100%; height: 650px; display: none; visibility: hidden;" rows="2" cols="20">

Could you please tell me how to manage to have display:inline and visibility:visible? Is it something about configuration? maybe configuration files?

Thanks in advance.