[ Closed ] More Calculate windows?

In some case several Calculate windows in one graph would be handy. An example is shown in an attached picture. I could imagine that by selecting a Calc function the docked window would appear. After being undocked, next Calc selection should call a new docked window, and  the window(s) undocked so far would stay visible, until closed individually. I have no knowledge how difficult would the programming be,  it's just an idea.