Is it possible to use the new Gradient tool on a Shape layer?
I'm struggling to recreate this simple Gradient design:

I want to recreate the linear gradient that's inside this cirlcle in Photoshop.
I first draw a circle with the Ellipse tool (U) as a Shape layer.
In the Properties panel, I select on the Fill icon where I get to the Gradient editor.
Then I edit the Starting and End colors using the Picker. So far so good.
But, I don't seem to see the color change much in the circle?
After a while, I reasoned it's because the Gradient is calculated (behind the scene, AFAIK) to the "Entire canevas", and not only, as it's done in Illustrator, on the object itself. To demonstrate this, I drew another shape, a rectangle, on a new Shape layer, that extends to the whole canvas and got this:

What would be my options?
I thought I was going to get around this by using the new Gradient tool but it does not seem to work inside a shape?
Any help is appreciated.
