Search - what does it call?

Hi all,

When using the Movie Library menu there are options such as View, Sort By, Filter and many others including Search.

When you select search, a window pops up in the middle of the screen with the ability to enter a search term.

I have looked and I have looked but I cannot find the command to activate the window in the skin anywhere... I found:
which turns 'Search' on and off, but just can't find what it calls when you click it.

Can somebody help?

Many thanks,

Pete