Setting string in static text box requires a pause after setting otherwise doesn't update string

I have found some odd behaviour in my GUIDE GUI recently that I can't find an answer to.

I have a static text box on my GUI that displays the program run status. When a button is pushed, a simulation starts that takes a few mins to run.

The first line of code in the callback for this button updates the static text to reflect that the simulation is running. Then the simulation code/calculations begin.

If I don't put a short pause (0.1 sec or so) after the "set" function line of code, the static text box string does not change. Why could this be?

[Adam]

It's fairly standard that the UI does not constantly keep refreshing itself. A

drawnow

instruction should be sufficient, though I doubt it is much, if at all, faster than a 0.1s pause!

See

doc drawnow

for details.