Inconsistant UI between the Installed and History sections when expanding nested items

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In the Installed tab of the software centre to expand categories you only need to click on the name of the heading to expand it (ie. clicking on Games expands the Games section to view all installing items). However when in the History tab clicking on the date does not expand the options in the same way, here you have to click the small expander arrow.

I may be the only person who is silly enough to have been stumped by this for a while! But it is inconsistant in that it is much easier to expand categories in the Installed tab. I feel that the History tab is poor for accessability due to the need for mouse accuracy to click the small arrow. In both sections using Tab and Enter to expand the categories does not work which I feel would also help to alleviate the "problem"

Using Ubuntu 12.04
Software Centre version: 5.2.1