Select one object and eye drop colour from another

This seems like a very basic thing, especially when working with vectors, as exists in pretty much all vector editing software, but how do I do it in Toonboom, I want to be able to select one vector object and eye drop add a colour from another object, not have to navigate to the colour pallet every time, so I can remain in full screen

If I am understanding you correctly what you are looking to do can be achieved by leaving the Colour Picker window open.

Just make sure to check to box for Editors Always On Top under the General tab in Preferences.