Panels in-place editor won't show in panels even after setting renderer
Solved! 

It seems to me that there are two types of renderes for panels:

The first is the global renderer that indeed I've changed to "Panels in-place editor". The second is each Panel's own or Specific renderer.

My problem occurred because for some reason, My Panel's own renderer wasn't affected from the global one, and stayed "Standart". I have no idea why that happen (might be a bug)...

Anyways, to change your Panel's own renderer just go to it's Panel.page\Panel.node and click on the tab "Edit" located on it's top. Thus when you edit the Panel itself you could choose it's own renderer and Problem should be solved by then. 

All luck, Ben.