CKEditor does not work when CKEditor is in the dialog box

Question

I am using CKEditor 3.6.1 in my GWT project.

In the dialog that pops up, I have CKEditor.

Here When I click the “Download Image” button or other tools from the CKEditor toolbar, pop-ups successfully come.

But I could not click or edit anything inside the pop-ups, I could not even close the pop-ups.

I used CKEditor in a test application, where I used CKEditor in a regular widget, and not in a dialog. There CKEditor popups worked great.

Why don't CKEditor pop-ups work when they come through a dialog?

Thanks in advance.