Sprite cant have focus or what? stage.focus = null?

Hello!

I am having a strange issue here with focus. When I click on a Sprite on the stage, the stage.focus is set to null!!
Its a pure Sprite object, with no children, I draw things on it using graphics.beginBitmapFill.
Why this happens? When I click on a TextField, the stage.focus is set to the tf normally! :pirate3:

Thank you for the help! :wink: