Annotations on Combo and Area Displays

Description -

Currently you can place annotations on line displays to provide an understanding when events have happened in time.  However, for other trend views like Area and combo, you cannot apply annotations.  

It would be great to be able to do so.  

Why is this feature important to you -

It makes annotating events easier to adopt across multiple views.  It doesn't force the analyst to use only one display method.  

How would you like the feature to work - Allow annotation for area, bar, and combo displays.  

Current Behavior  - only line charts allow for annotations.