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Using JS to change cascading dropdown

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I have found that if I manually click on a dropdown that is a parent to another cascading dropdown,  the cascading dropdown works.

But when I try to use javascript to change the value of that parent dropdown,  I find that it does not kick off the cascading activity of the cascading dropdown that is connect to it.  Strangely,  the value changes in the parent dropdown (so it works),  but it doesn't impact the cascading dropdown.

The js code I am using to change the parent dropdown value is:  document.getElementsByName("cbParamVirtual1")[0].value="2012";     which successfully updates the value, so I know the JS works.  But it doesn't impact the cascading dropdown. 

Is there an onchange event that is misfiring?  Any suggestions?

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