report cursor position to plugin

Hi,

is there a way to report back to a custom format dropdown so that it can display the name of format that is selected?

I have created a custom dropdown that sets a format to the selected text like this:

var fragment = editor.getSelection().getRanges()[0].extractContents();
htmlString = '<span class="sapclass '+value+'"></span>';
container = CKEDITOR.dom.element.createFromHtml(htmlString, editor.document);
fragment.appendTo(container);
editor.insertElement(container);