simultaneous pauses loop in GUI

I create a function for a togglebutton for control system.

if get(togglebutton1,'value')==1
    if get(checkbox1,'value')==1
        if pumptime1>0
            start(pump1.t)
            pause(pumptime1)
            stop(pump1.t)
        else
            start(pump1.t)
        end
    end
    if get(checkbox2,'value')==1
        if pumptime2>0
            start(pump2.t)
            pause(pumptime2)
            stop(pump2.t)
        else
            start(pump2.t)
        end 
    end
elseif get(togglebutto,'value')==0
    if get(checkbox1,'value')==1
        stop(pump1.t)
    end
    if get(checkbox2,'value')==1
        stop(pump2.t)
    end
end

how can I made the pause do in the sametime? please help!

[Rik]

Additional explanation in later post:

I create a button that can detect several checkboxes, however I can not find a way to run those checked checkboxes in the same time. I try to use individual if for each checkbox, it can be well run when the checkboxes checked. But when I use pause for each indivdual checkboxes, the loops would not run in the same time count the pause together. they become to go through the pauses one by one in each checked checkbox. Is there any way that can make those pauses start together?

[Rik]

Have you tried to first find out the length of every pause, and after that running them all at the same time (by having only 1 call to pause)? You can sort the pause times in ascending order and run them in a loop.

[Kuang-Yu WANG]

because my pauses are actually variables, for example if I made pumptime1 to be 5, and the other with 0, it will start pumping pump1 for 5 sec and then pumping the pump2 and 3 in same time. Therefore, I think if I use the mathod of sorting it could not work either.