custom circle copper fill in ares proteus
I did it like this (2D Graphic circle mode) in combination with (Zone mode) in this case the pad zone is defined as compatible and the outer zone is defined as solid 4 arcs make a part circle outer-edge in my case. 

You can use (Zone mode) /-solid- to fill space in between circles as long as you increase the (2D Graphic circle mode) /-width- to cover the edge of (Zone mode) /-Boundary-, also you can thicken and dilute the grid with F2 F3 F4 keys and manipulate the vertexes in such a way that they stay inside the circle boundary.