jQuery Mobile 1.4.0 RC1 collapsible events (collapse/expand) happens too late

jQuery Mobile 1.4.0 RC1 collapsible events (collapse/expand) happens too late

Hi, would like to ask, when did the naming of the events changed? When I was using 1.3.2, I used the events 'collapse' and 'expand' for collapsible to add in animation when the collapsible is expanded and collapsed. However, in 1.4.0, the name changed to 'collapsibleexpand' and 'collapsiblecollapse'. Even if I bind the events to allow animation when expanding or collapsing the collapsible, the events were triggered too late, and the contents is already displayed when the 'collapsibleexpand' event is triggered and vice versa. Is there any way I am able to make the animation work without modifying the src script? Now I'm using the workaround of shifting the events trigger to the top in the '_handleExpandCollapse' function so that the events will be triggered before the css is changed and the collapsible content is displayed.