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The item you wish to access is in a RadDataBoundListBox, that is in a RadExpander control, that is in another RadDataBoundListBox. The inner list box has its IsHitTestVisible property set to false., which blocks all user interactions with the control. This is intentionally, because the scrolling does not work properly for the inner DataBoundListBox, but you can workaround this problem if you set MaxHeight of the inner list box control. Here is how your control could look like:
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