Select an option from an ExtJS ComboBox

Automating an ExtJS web application can be difficult due to the dynamic nature of the page. For example, the majority of unique ID attributes in the HTML will be different between builds, which causes problems locating elements reliably. Another issue is selected items from a ComboBox, which is not a normal HTML <select> element, but an <input> that is populated from data in a completely separate section of the DOM.

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