Tomahawk how can i hide folders icons in t:tree?

Hi,
i use the tag t:tree in myfaces. I have added my own icons to the tree, but i don't know how can i hide old folders icons of tree. Can anybody help me?
Thanks and Best Regards,
Sergey

Hello~
I've got a bad hacking experience
It's a serious criminal hacking.
Console app on iMac had hacked  by some Security Agents in China.
I need to lock 'db' folder including system key on Mac OS.
Please kindly inform me the method how to lock 'db' folder with password.
Such as this picture below :
Have a nice day~

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