Cleanup: Dev sample.
Disable Image plugin when Image2 is to be loaded.
Cleanup: Don't use removePlugins in samples since Image is disabled automatically.
Disable ImageButton when Image2 is to be loaded.
Added comments for odd hacks.
Simplified definition of Image2 dialog.
Fixed: Broken dialog tab navigation when Browse button is visible.
Reverted and made the hack for dynamic Browse button more friendly.