HTML Widgets; Tab; FocusFirst not focusing on DBCombo controls

Sometimes, when using the widget.UI.Tabs.FocusFirst() method to focus on the first control on the page, the correct control does not receive focus.

This occurs when running from within finPOWER Connect where the first focusable control is a DBCombo that is refreshing from a global collection. The issue was that, when fetching data, the DBCombo sets itself to read-only and was therefore being ignored.