How does real estate CEOs get rich from IPOs?

[Tiara Murray]

I read that Trump had an IPO for Trump Organization, or some other company, and all of a sudden he's a billioaire. How exactly does this work? I know that they probably still have the same amount of cash in the bank, and the same salary, so all of their net worth is tied up in their stock right? So how do these CEOs start to spend to lavishly? Do they sell some of the stock that they had originally retained during the IPO?