Context menu button, auto scrolling

[urbanurba]

This is a cool library, but I can't figure out how to do it:

• context menu in the form of a button anywhere in the window.
  (In the examples, there is only if you right-click on a certain area, or only at the top of the window - File, Edit, etc.)
• add scrolling for the context menu, for long lists;
• automatically scroll down when adding a new line in NewMultiEdit (or other).