Add Link(and Image, ...) into textarea in source mode

Hello.

I want to add link, image and media into textarea in source mode.

In source mode, these buttons(link, image and media) were disabled.

But I solved that problem through below codes.

CKEDITOR.instances['editor1'].getCommand( 'image' ).enable();

But I can't add link, image and media into textarea in source code.

It created some error messages.

Uncaught TypeError: Cannot read property '$' of undefined 

Uncaught TypeError: Cannot read property 'collapsed' of undefined 

How Can I solve that problem?

Thanks.