Telegram WebApp: loading animated icon - telegram

I've made some WebApp on Telegram and that's fine. When my WebApp is loading, there is a small grey animated icon (like a small robot).
But I notice that when the "demonstration WebApp Durger King" is loading, the animated icon is different (small hamburger).
How can I change the animated icon for my WebApps?
Thanks

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https://i.imgur.com/rgLWDgg.png
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Does the following help?
http://groups.google.com/group/chennai-flex-user-group/browse_thread/thread/cffb9ab56450c28e
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