Find all polynomials $P(x)$ which have the property

$P[F(x)]=F[P(x)],\phantom{\rule{1em}{0ex}}P(0)=0$

where $F(x)$ is a given function with the property $F(x)>x$ for all $x\ge 0$

$P[F(x)]=F[P(x)],\phantom{\rule{1em}{0ex}}P(0)=0$

where $F(x)$ is a given function with the property $F(x)>x$ for all $x\ge 0$