All RadControls are rendered in a div HTML element. I tested RadAutoCompleteBox with Label and the label is placed correctly on the same line with the control.
Please note that RadAutoCompleteBox has Label
property, which you could use to add label. Attached is a sample page. Here
is a screenshot showing how the control is displayed at my side.
If this is not helpful, please provide sample runnable project, where we will be able to inspect your exact implementation.
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