In the DropDownList control, the input element is hidden and non-editable. When TabIndex is set to the DropDownList control using the HtmlAttributes property, it is set to the input element and TabIndex will not work for hidden elements. So, to set proper TabIndex for the DropDownList control, it must be set to the control’s wrapper element.
Consider the following example,
In the previous code, the DropDownList’s client-side create event is used to set the TabIndex to the control’s wrapper element.
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