Is there any way to get the amount of components included in a GPanel?

I've tried gpanel.size(), gpanel.length()...

And! I have another question... Is there a way to easily remove all "children" from the panel?

To sum up, I would like to know if there is a way to count the total amount of components within a GPanel and if there is a way to remove all the components from the GPanel at once?

Thanks in advance!!!