Slider Windows in AC21

[Anonymous]

Aloha All,
I am trying to show an X - O - X slider window and don't seem to be able to illustrate properly. A typical U.S. xox slider is 25% 50% 25%.

I've attached an image of what I can create from (3) separate windows, but this creates a very inaccurate window schedule.
thanks in advance.

dean