Could you please elaborate more which clear button you mean - The RadAutoCompleteView Entry (x) button or the RadAutoCompleteView Tokens (x) button?
1) AutoCompleteView Entry (x)
button does not provide customization options.
2) Tokens (x)
button could be customized through the TokenTemplate
property. I have attached a sample that shows how to achieve this. Note that when the RadAutoCompleteView Token Template is used its override the default template. In this case you should add the "X" icon manually. The icon is located in the telerikfontexamples.ttf file. For more details regarding this check the following link from our documentation: https://docs.telerik.com/devtools/xamarin/styling-and-appearance/telerik-font-icons
Please review the attached sample (The icon is defined as a resource in the App.xaml file and used in the AutoCompleteView TokenTemplate - MainPage.xaml file) and let me know if you have any further questions.
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