editor.ui.addButton( \'ImageUpload\',{ label: \'Upload Image\', command: \'popup_image_uploader\', icon: this.path + \'im
.cke_button_label.cke_button__CMDNAMEHERE{ display: inline; }
will work for all skins, unlike the answer above(note the double underscore between buttons and CMDNAMEHERE)
you can place it anywhere in your own css