Border of widget inside uniform grid panel

I have a uniform grid panel that is populated with ui widgets. In this case images. I set up the tab button to go the the next widget and that works however I would like to have the widget get highlighted or update the border color but I can’t seem to figure out how to do that. I have a border on the ui widget. Any help would be appreciated.

Can you show how this is done? Generally speaking, once you obtain a reference to the highlighted widget, you can fire its Custom Event that updates the border colour.