Since $(3,6)$ is on the graph of $y=g(x)$,
we know that $g(3)=6$.
Therefore, $h(3)=(g(3))^2=6^2=36$.
So the point $(3,36)$ is on the graph of $y=h(x)$.
The sum of the coordinates of this point is $3+36=\boxed{39}$.
The answer is: 39
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If the point $(3,6)$ is on the graph of $y=g(x)$, and $h(x)=(g(x))^2$ for all $x$, then there is one point that must be on the graph of $y=h(x)$. What is the sum of the coordinates of that point?

### Answer:
