How is the packaged template created?

Hi everyone.  

I am curious to know how the packaged "Interactive Timeline" template was created in Storyline 2.  Specifically, how was the txt_Event box that has a 'ghost' shape next to it where you can manipulate its State (normal, hover, selected) created.

There are nine boxes with a timeline down the left hand side that has these 'ghost' circle shapes next to them.

How can I create the text box and have the shape next to the text box .

THANKS SO MUCH

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