Tab Event - Designer

Hi,
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how can I set a value of dropdown depending on a a previuos dropdown ?
I still want to see all values, but I want to set a specific one.
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I thought I can do it with Tab Event - Designer: What sintax do I need to use?
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This is what I've done:
http://prntscr.com/jqm1ve
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Many thanks!

There's a demo form "dynamic dropdown" explaining how to do it.

Thanks Healyhatman,
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but unfortunately it does not.
I mean: in the demo, you got different array of values for the second dropdown, according to the value you set in the first dropdown.
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Instead in my case I would like to select a specific value of the second dropdown when setting the first dropdown: so same array of value but not the first selected, but the one I choose.
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That's why I was trying to use :
Tab Event - Designer: http://prntscr.com/jqm1ve
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Thanks for Advice!

put {var:yourvariable} in the "selected value" portion of the second dropdown. Your reloading event then needs to set the value of that {var} before you call the {view:view_name}

Thank you very much!
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Excuse further questions:
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1) When you said:
"Your reloading event then needs to set the value of that {var} before you call the {view:view_name}"
You mean I need to create an Ajax event to reload the selected value, on change of dropdown 1?
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2) Tab Event - Designer: I've find no documentation on it. It seems is not to be used in my case, but I'd like to learn about it. Can you suggest a link to docs?
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Thank you for your help!

Sorry I've just realised you're using the old v5. I don't know anything about that, sorry.

It's ok. Thank you for your time, you are always very helpful!
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cheers!