Erroneous buttons created in AppDesigner

I have an App created in AppDesigner that keeps creating five copies of the same button whenever I open the app. After deleting and/or resaving the entries in AppDesigner, the same buttons are recreated when I open the app again.

I have edited this app on both Windows and Mac, in 2017B, 2020B and 2021A. I am seeing this issue currently on Windows 2021A, but believe I also saw it on Mac 2021A. I would ideally like to keep functionality across all versions and operating systems, but understand if this is causing the issue.

I cannot easily create a minimal example, but will try if it would be helpful.

[Image Analyst]

What are the buttons called? When you save the new UI in App Designer, are there callbacks for those buttons still in the source code?

Are the buttons created upon launching App Designer, or at run time? Is they're created at run time, do you have any calls to the uibutton() or uicontrol() functions anywhere in your code that might create additional buttons?

[Jeremiah Sullivan]

Let me know if I miss anything

• Button is named "RefreshButton_2". I can rename and delete all occurances of the button and the auto-generated code updates appropriately (no reference to RefreshButton_2 remains).
• Callbacks: No, if I delete all of the buttons there are no matches for "RefreshButton_2" anywhere in the code (callback or otherwise); at least the code exposed in "Code View"
• Launching vs. Runtime: I hypothesize they are created when I open the app (`>> appDesigner(filename)`)
• If I just open and close the app, it prompts me to save (file was modified), leading me to believe the app was properly saved
• I can run the app just fine after I delete the buttons, so I don't think anything bad is happening at runtime
• There are no calls to uibutton outside of the automatically generated (uneditable) code. There are no calls to uicontrol

It seems like the number of buttons each iteration created has increased the more I play with it. Here is what the auto-generated properties look like now (I renamed one of the original buttons to RefreshButtonAgain, which is not duplicating itself).

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButton_2 matlab.ui.control.Button

RefreshButtonAgain matlab.ui.control.Button

Here is the auto-generated creation code. The callback-behavior is a bit strange (not every button has a callback)

Edit: it shares the "RefreshButtonPushed" callback with another button, not sure why that would be an issue though

% Create RefreshButtonAgain

app.RefreshButtonAgain = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButtonAgain.Position = [12 11 57 28];

app.RefreshButtonAgain.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.ButtonPushedFcn = createCallbackFcn(app, @RefreshButtonPushed, true);

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.ButtonPushedFcn = createCallbackFcn(app, @RefreshButtonPushed, true);

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.ButtonPushedFcn = createCallbackFcn(app, @RefreshButtonPushed, true);

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.ButtonPushedFcn = createCallbackFcn(app, @RefreshButtonPushed, true);

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.ButtonPushedFcn = createCallbackFcn(app, @RefreshButtonPushed, true);

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.ButtonPushedFcn = createCallbackFcn(app, @RefreshButtonPushed, true);

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.ButtonPushedFcn = createCallbackFcn(app, @RefreshButtonPushed, true);

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.ButtonPushedFcn = createCallbackFcn(app, @RefreshButtonPushed, true);

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

% Create RefreshButton_2

app.RefreshButton_2 = uibutton(app.DataFiltersPanel, 'push');

app.RefreshButton_2.Position = [12 11 57 28];

app.RefreshButton_2.Text = 'Refresh';

[Michael Van de Graaff]

I had a similar problem, but with EditFieldLabels rather than a button. Eventually, I got sick of it and deleted all version of the labels being duplicated, an option which is more convenient when it's just a label.

I never did find a better, and my problem did not seem to multiply as yours does

[Adam Danz]

Contact tech support. In a previous question, tech support provided a function the user that solved the problem.

Answer 1

[Reshma Nerella]

Hi,

This bug was fixed in R2018b Update 3.

This issue might still be seen in future releases of MATLAB while editing the apps that were are created in any version before R2018b Update 3.

In your case, instead of editing the app in R2020b or R2021a, create a new one to prevent the issue.