EVENT TAB - DESIGNER : CHRONOFORM V5

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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There is any docs?
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Many thanks!

Hi M.Abletech,
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While you can add a full list of options - you are using only one and it needs to be a value=text setting - I don't think that you can select a particular value this way.
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You can do that using custom Javascript.
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Bob