How do I get/set individual bars info and action on my bar graph

I am trying to Highlight an individual bars in a bar graph, during a mouse click selection. I've been reading up and trying to solve this problem for some time, and I'm at a loss as to how to solve it. So far when i click a bar i can Highlight the entire bar graph and not the individual bar:

set(get(gca,'Children'),'ButtonDownFcn', @Mouse_action);

function Mouse_action(hObject, eventdata) obj = get(gcf,'currentobject'); set(obj, 'FaceColor', [0.25 0.25 0.25]);

Im using matlab 2015b. Any idea? Thanks in advance. Ana