Hi there, first of all great plugin. This is exactly what I am looking for but it seems in 2 different 3.5 WP installs I seem to be having the same issue.
When I populate your widget and test it in a 3.5 Install I see that all functionality does not work. the widget simply does not expand or collapse, it just is static and open.
If you have a solution for me it would be much appreciated.