How to hide a uitab with RadioButtonGroup?

If I create my tab, some functions need much time. Because the user shouldn't see a half-finished tab, i hide the tab with

app.Tab1.Parent = [];

and unhide the tab at the end with

app.Tab1.Parent = app.TabGroup;

For the most objects, this procedure works fine. Now I added a RadioButtongroup and noticed that the group isn't visible.

Here is a possible Gui to recreate the problem:

classdef testgui < matlab.apps.AppBase

    properties (Access = public)
        UIFigure                        matlab.ui.Figure
        TabGroup                        matlab.ui.container.TabGroup
        tab_a                            matlab.ui.container.Tab
        tab_b                            matlab.ui.container.Tab
        NormalButton                    matlab.ui.control.Button
        ButtonGroup                     matlab.ui.container.ButtonGroup
        RButton1                        matlab.ui.control.RadioButton
        RButton2                        matlab.ui.control.RadioButton
        UIAxes                          matlab.ui.control.UIAxes
        WelcomeLabel                          matlab.ui.control.Label
    end
    
    methods (Access = public)
        
        function app = testgui(app)
            app.start_app_tab_a()
            pause(1)
            app.create_tab_b()
            app.tab_b.Parent = app.TabGroup;
            app.TabGroup.SelectedTab = app.tab_b;
        end
        
        function app = start_app_tab_a(app)
            app.UIFigure = uifigure();
            app.UIFigure.Position = [100 100 800 500];
            app.UIFigure.Name = 'UI Figure';
            
            app.TabGroup = uitabgroup(app.UIFigure);
            app.TabGroup.Position = [1 1 800 500];
            app.TabGroup.Visible = "on";
            
            app.tab_a = uitab(app.TabGroup);
            app.tab_a.Title = "Tab A";
            
            app.WelcomeLabel = uilabel(app.tab_a);
            app.WelcomeLabel.Position = [250 250 200 20];
            app.WelcomeLabel.Text = 'Wait here until Tab B looks fine';
        end
        
        function app = create_tab_b(app)
            
            app.tab_b = uitab(app.TabGroup);
            app.tab_b.Title = "Tab B";
            
            % the Problem?
            app.tab_b.Parent = [];
            
            % Create UIAxes
            app.UIAxes = uiaxes(app.tab_b);
            app.UIAxes.Position = [200 200 400 250];
            
            % pause = other functions
            pause(3)
            plot(app.UIAxes,randi(5,20,1),randi(5,20,1))
            
            
            app.NormalButton = uibutton(app.tab_b, 'push');
%             Button.ValueChangedFcn = createCallbackFcn(app, @ButtonPshued, true);
            app.NormalButton.Position = [300 100 80 25];
            app.NormalButton.Text = 'Button0';
            
            %create RadioButtongroup
            app.ButtonGroup = uibuttongroup(app.tab_b);
            app.ButtonGroup.Position = [400 100 100 90];
            
            app.RButton1 = uiradiobutton(app.ButtonGroup);
            app.RButton1.Text = 'Option A';
            app.RButton1.Position = [5 50 90 20];
            
            app.RButton2 = uiradiobutton(app.ButtonGroup);
            app.RButton2.Text = 'Option B';
            app.RButton2.Position = [5 20 90 20];
            
            app.RButton2.Value = true;
            app.RButton1.Value = false;
        end
    end
end

If I delete this line

app.tab_b.Parent = [];

the user see the RadioButtonGroup, but the user could change the selected tab manually, before tab b is finished. The main question is, why do the radiobuttons disappear if I change the parent of the tab?

Answer 1

[T B]

If

tab.Parent = TabGroup

then the default is

app.ButtonGroup.Units = "pixels"

and if

tab.parent = []

then the default is

app.ButtonGroup.Units = "normalized"

Therefore the position [400 100 100 90] wasn't in the visible range. But why is Matlab doing this?

The solution of the problem is:

app.ButtonGroup = uibuttongroup(app.tab_b);
app.ButtonGroup.Units = "pixels";
app.ButtonGroup.Position = [400 100 100 90];

Answer 2

[Geoff Hayes]

Why not just hide or show the tab using the Visible property? For example, you could do

app.TabGroup = uitabgroup(app.UIFigure);
app.TabGroup.Position = [1 1 800 500];
app.TabGroup.Visible = false;    % <----- hide the TabGroup

and then show it with

app.TabGroup.Visible = true;

Or maybe I'm misunderstanding what you are trying to accomplish?

[T B]

Thanks for your suggestion. If I have only one tab, this solution work fine. But I don't want to hide the other tabs in the tabgroup. I will update the code and the question to a more complex example.

[Geoff Hayes]

Then perhaps you can hide and show the tab instead of the tab group:

app.tab_a.Visible = false; % or true to show

[T B]

tabs don't have the property 'Visible'

[Geoff Hayes]

That seems* like a bug then.

Have you seen Adam's answer from https://www.mathworks.com/matlabcentral/answers/550827-matlab-gui-tabgroup-visibility-checkbox#comment_904678 where it is suggested that you can prevent navigation to certain tabs using the SelectionChangedFcn? I suppose that you could do the same and then only allow navigation until that tab until is is ready.

[T B]

thanks for your efforts. The problem was related to the units.