A retractable animated button that can be used to expand or collapse other panels.
The side button is a useful control that is also quite common in modern web applications. It adds a small button elastic button to a container. It can be docked to the left or the right and expand in the opposite direction (similar to the GMail options vertical bar).
It has a collapsed property that is used in the NavigationBar sample to show/hide a FlexLayoutPanel. This FlexLayout can contain any kind of elements, in this sample it just hosts 2 picture boxes. We also dropped 2 animation extenders on the page so we are able to define sliding effects when the panel is shown/hidden:
