While I find that many of your controls are useful; the ones I really want to use.  Accordion, Drawer, and Menu are limited to being data bound only.  I would really like the ability to make items in a declarative format.  Can you please consider this for future builds?

Currently, it is possible to expand or collapse PanelBar items programmatically.

There should be a way to prevent a specific PanelBar item from collapsing or expanding.

Please expose cancellable OnExpand and OnCollapse events similar to other components. This will give developers the ability to apply custom interaction based on their scenario.

I want to set the height of my panelbar and have longer content scroll.