>> "How can I determine the set of elements that belong to one KendoUI ComboBox..."
The set of elements that belong to a Kendo UI widget consists of all elements inside the widget wrapper. In this case the ComboBOx wrapper is <span class="k-widget k-combobox">
>> "...and also parse them into a KendoUI ComboBox..."
I am not sure what do you mean by "parse", but generally, you can obtain reference to the widget instance like this:
"... to set attibutes such as ReadOnly and Visibility."
I have provided some relevant information here:
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