In the top thread you linked to, you will see this at the top of the plugin you need to create:
PHP Code:
if (THIS_SCRIPT == 'yourpage')
That needs to be a unique condition as stated in that thread:
Quote:
Your condition MUST be unique! If you use a condition that is also going to evaluate to true for another tab, then they will both be highlighted and the wrong submenu may show up underneath.
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It needs to be a condition that will only be true when you click on that tab.