Select and deselect question on graph

[21Cash]

Please add option to select or deselect a question in the graph such that it zooms in ontothe selected questions.
This way we look at the individual graphs, because usually the q4 has less AC's so we cant look at its graph in detail.
For example, If we deselect the q1,q2,q3 the contest graph will be focused on q4 and set the scale of the graph to give a more clarity.