Button activity only works if I set a breakpoint in Matlab App Designer

I have the App Designer code below that should make the Button invoking the script disappear while the script runs. At completion, I have a command "app.BeginoptimizationButton.Visible="on" to make the button available again. This only works if I put a breakpoint in the script at the place indicated below, and then it works as planned. Without the breakpoint, the button remains visible though the rest of the script runs flawlessly.

I have tried using a lamp to indicate when the script is running with exactly the same problem: the lamp doesn't change without a breakpoint at the line where the command is located.

I can't figure out what to do to fix this and would greatly appreciate any advice.

Thanks,

Andy

____________________________________________

% Button pushed function: BeginoptimizationButton

function BeginoptimizationButtonPushed(app, event)

'Starting optimization'

app.MinMethod='fminsearchbnd';

app.approachinfo=['Approach: Revised Starling model using ',app.MinMethod];

app.solverinfo='solver: ode15s';

<breakpoint> app.BeginoptimizationButton.Visible="off";

t=app.t;

etc.

Answer 1

[Voss]

Put a drawnow after lines of code that make changes to the GUI which should take effect immediately, e.g.:

% starting optimization
app.BeginoptimizationButton.Visible="off";
drawnow
% ...
% ...
app.BeginoptimizationButton.Visible="on";
drawnow

[Andrew]

Thanks, Voss! Works well!

[Voss]

You're welcome!