Removing ExtJs' panel's collapse button and it's floating animation

Removing ExtJs' panel's collapse button and it's floating animation

While using ExtJs border layout I want my East panel to be expandable &
collapsible only by clicking on the panel's header, i.e. use floating
characteristic. My queries are:
How do I remove the collapse button?
How do I remove floating animation? (animCollapse property seems to work
only on collapse & expand actions performed on the collapse button)