tooltip in App Designer

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Pappu Murthy
Pappu Murthy on 2 Nov 2018
Commented: Cris LaPierre on 15 Nov 2019
In my App designer for one of the panels I defined a tooltip. Now I want to get rid of it. Everytime i highlight and get rid of it in Code design view, I get a long series of read error messages but the tool string does not get removed. I can't go into code view and delete the line for tooltip string either as it is grayed out. So my question is how do I completely get rid of it without deleting the panel altogether and start over again?
Pappu Murthy
Pappu Murthy on 23 Nov 2018
I am just setting a 'string' as Tool tip and it shows correctly. But when I try to delete it by 'highlighting' it and 'backspace' it gives all those errors.
here is the complete code:
classdef MyTest2 < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
TestingPanel matlab.ui.container.Panel
GOButton matlab.ui.control.Button
% App initialization and construction
methods (Access = private)
% Create UIFigure and components
function createComponents(app)
% Create UIFigure
app.UIFigure = uifigure;
app.UIFigure.Position = [100 100 640 480];
app.UIFigure.Name = 'UI Figure';
% Create TestingPanel
app.TestingPanel = uipanel(app.UIFigure);
app.TestingPanel.Tooltip = {'adfdaf'; ''};
app.TestingPanel.Title = 'Testing..';
app.TestingPanel.FontWeight = 'bold';
app.TestingPanel.FontSize = 16;
app.TestingPanel.Position = [51 226 260 221];
% Create GOButton
app.GOButton = uibutton(app.TestingPanel, 'push');
app.GOButton.Position = [80 123 100 22];
app.GOButton.Text = 'GO';
methods (Access = public)
% Construct app
function app = MyTest2
% Create and configure components
% Register the app with App Designer
registerApp(app, app.UIFigure)
if nargout == 0
clear app
% Code that executes before app deletion
function delete(app)
% Delete UIFigure when app is deleted

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Accepted Answer

Cris LaPierre
Cris LaPierre on 23 Nov 2018
Edited: Cris LaPierre on 23 Nov 2018
I see it now. This looks like a bug to me. I'll report it. If you do not want the tooltip to appear, the best workaround I can think of is to add the following to your startupFcn Callback.
app.Panel.Tooltip = '';
Of course, replace Panel with whatever you named it.
Daniel Bailey
Daniel Bailey on 12 Apr 2019
Edited: Daniel Bailey on 12 Apr 2019
@Jake Shea & @Robert:
As far as backwards compatibility goes. I was able to remove blank tooltips from the code by opening it in a version that predates 'Tooltips' release.
To be exact with what I did:
Steps 1-3 completed in MATLAB 2019a
1) Deleted all Tooltip text
2) Save Copy As
3) Save as type: MATLAB 2017b APP (*.mlapp)
Steps 4-5 completed in MATLAB 2017b
4) Opened MATLAB 2017b
5) Right clicked to open *.mlapp file
At this point all of the tooltips had dissapeared from the code.
Interestingly enough, only saving the file as an earlier version did NOT fix the problem. Only at the point that the code was opened in app designer did the app.*.Tooltip = {''}; code dissapear.

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More Answers (1)

Johan on 15 Nov 2019
Anybody know if this bug has been fixed in the newest version of Matlab?
2018B definitely still has this problem.
  1 Comment
Cris LaPierre
Cris LaPierre on 15 Nov 2019
This should be fixed in 2019a.

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