Textbox autocomplete extender scroll click issue in asp.net

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VB

ASP.NET

Textbox text change it should autocomplete list of data in that textbox .When clicking textbox list of data it fires textbox change event and when i using scroll bar right side of the list it firing textbox changed event and i'm losting data. Autocomplete list disappear when i scroll. Please advice on this

1. textbox box i used webservice to autocomplete list of data

2. Selected value im getting through textboxchanged event

3. Scroll in textbox autocomplete extender i need not fire textbox changed event because im losting the list of data

Note : But it working fine Chrome.FireFox not in Internet Explorer 11