show buffer in anther window and jump to function under the cursor

[Tommy Huang]

1. I am using semantic-ia-fast-jump and semantic-mrub-switch-tags to jump back and forth to the function definition under the cursor. Now I am trying to switch to use helm + etags. 

However, I don't know how to set the config to jump back and forth the etags under the cursor. Is there any command that I can bind to?

2. When using grep or show tag lists, another window is used to show the content of  the current highlighted tags/grep results. 

However, in helm, I have to type C-z  C-z to show it in anther window, it's quite inconvenient. I would like another window changes its content when I browse through the tag/grep results. 

Is there any way to do that?

Thanks.