when polar plot is zoomed it does not show values on the radial axis and the polar axis.

Dear sir/madam,

I am working on antenna radiation patterns and using polar() to plot the radiation pattern. When I zoom into the polar graph, it neither shows the radial axis values nor the polar axis values. Because of this it is difficult for me to know at which angle I have nulls, or the value of the side lobes etc... How can I use matlab, to show the values when I zoom into the polar plot? Looking forward for your reply.

Thanking you, BSD