Interactive particle information printout

Clicking on a particle in the display should pop up an info box containing the particle species, mass, momentum components (in Cartesian E/px/py/pz and eta/rap/pT/phi schemes), etc. The box should be either "attached" to the click-point, or something like a sidebar: the former would allow more than one particle's info to be displayed at the same time... maybe it could/should even live in the 3D space?

(It'd be nice if we could also do this in the graph view...)