Hello Jon,
Indeed, you are correct that the code that I send you works only in a simple page since the id (that we use in code behind to expand/collapse the controls) of the RadPanelBar will change when placed in a content page. In such case, when you are trying to access different controls between the master and the content page, I would suggest that you take a look at the example
here where you can find the basic examples and detailed explanation on such scenario.
Greetings,
Kate
the Telerik team
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