Powershell: How to create and set an image for a tray icon?

Question

I want to create a tray-icon object, set an image for it and pin into the system tray. I have just found how to make a tray icon like a popup balloon in powershell.

But I want something like in the following photo:

The icon should be always visible and I should be able to change the image based on some events. Exactly how dropbox changes the icon when a new file is being uploaded.