ThumbarButton Object 
- iconNativeImage - The icon showing in thumbnail toolbar.
- clickFunction
- tooltipstring (optional) - The text of the button's tooltip.
- flagsstring[] (optional) - Control specific states and behaviors of the button. By default, it is- ['enabled'].
The flags is an array that can include following strings:
- enabled- The button is active and available to the user.
- disabled- The button is disabled. It is present, but has a visual state indicating it will not respond to user action.
- dismissonclick- When the button is clicked, the thumbnail window closes immediately.
- nobackground- Do not draw a button border, use only the image.
- hidden- The button is not shown to the user.
- noninteractive- The button is enabled but not interactive; no pressed button state is drawn. This value is intended for instances where the button is used in a notification.