How to extend a dojo class using a typescript class?

dojotypescript.js

///<reference path="../ref.d.ts"/>
import declare = require("dojo/_base/declare");
import lang = require("dojo/_base/lang");
import ContentPane = require("dijit/layout/ContentPane");

class LayerStylePane extends ContentPane {
    constructor(options: any, container?: HTMLElement) {
        this.baseClass = "layerStylePane";
        options.content = "<b>HELLO</b>";
        super(options, container);
    }
    foo() {
    }
}

export = LayerStylePane;

// in mydijit.d.ts:

declare module "dijit/layout/ContentPane"
{
    class ContentPane extends dijit._Widget {
    }
    export = ContentPane;
}