Remove and replace contextual help icon-button

[GoogleCodeExporter]

Contextual help just works for the active frame on the right side of the 
contents panel.
Suggestion: remove this contextual help button located on the right of the main 
toolbar, and add an help button on the internal frame's toolbar.
Clicking on this icon-button will directly open-up the respective help. 

Original issue reported on code.google.com by bantc...@gmail.com on 11 Apr 2011 at 8:27