I want to develop an app for ubuntu, that integrates inside the calendar indicator/menu. It should allow to enter info right from it, and have several controls like input boxes, drop downs, spinners and buttons.

Is this possible to integrate/replace the standard date/time indicator?

If not, is it possible to create it as a separate indicator that when clicked opens a popup with all the controls and stuff?

I want it to look as part of the sys tray and not as a separate desktop app.

I'm using Quickly for this.

Thanks for your help!