How to make a traffic light with visual basic?

I have to make this traffic light with visual basic 6.0. It has to have 3 vertical picture boxes. To start of with green box has to be already filled with green colored background. It supposed to cycle through colors when Tab button is pressed down. Press Tab and colors should cycle, Green, Yellow, Red, Green,... show more I have to make this traffic light with visual basic 6.0. It has to have 3 vertical picture boxes. To start of with green box has to be already filled with green colored background. It supposed to cycle through colors when Tab button is pressed down. Press Tab and colors should cycle, Green, Yellow, Red, Green, Yellow,Red... How do I make that?
Update: No I want some help or so tell me what function and property to use. I don't ask for entire code
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