I have an application based on a html menu, that loads one application at a time.

I like to replace this html with a extjs treepanel or a menu or similar and load each application in its own tab or window.

All applications are developed with designer and has its own designer.js file to load all components.
I now like to replace my old html style to make a more homogenious look and feel of the application.

Please guide me if you have ideas of how this shall be done.