Don't ask me why, it works this way:
title: My Tiddler
\define btn() <$button
message="tm-close-tiddler">{{$:/core/images/done-button}}</$button>
<$button>
My Modal
<$action-sendmessage $message="tm-modal" $param="My Modal" btn=<<btn>> />
</$button>
title: My Modal
footer: <<btn>><$button
message="tm-close-tiddler">{{$:/core/images/close-button}}</$button>
!It works
Still searching for someone who helps me to understand.
)+(au
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