Class properties do not have values in uibutton callback

I have a uifigure and components in a class. I save 2 button handles as properties of the class: dockerButton and exitButton. When I click the dockerButton, the obj class I pass into its callback has an empty exitButton. When I click the exitButton, the obj class passed into its callback has both exitButton and dockerButton populated properly. I want this behavior for when I click the dockerButton; I want to be able to manipulate the exitButton that is a property of the obj instance passed in. What am I doing wrong?

When I click the dockerButton, it goes into dockView and my obj class is:

exitButton: [] <<-- I want this to have the handle to the exitButton!!

parent: [1×1 GridLayout]

borderPane: [1×1 Panel]

grid: []

title: 'GEO'

uuid: [1×1 java.lang.String]

cmapDir: [1×1 CmapDir]

dockerButton: [1×1 Button]

dockFile: 'arrow-collapse_16.png'

undockFile: 'arrow-expand_16.png'

When I click the exitButton, closeView gives me:

exitButton: [1×1 Button] <<-- I get both here!!

parent: [1×1 GridLayout]

borderPane: [1×1 Panel]

grid: []

title: 'GEO'

uuid: [1×1 java.lang.String]

cmapDir: [1×1 CmapDir]

dockerButton: [1×1 Button] <<-- so it's not a callback idiosyncracy

dockFile: 'arrow-collapse_16.png'

undockFile: 'arrow-expand_16.png'

classdef BaseView

properties

exitButton

parent

borderPane

grid

title

uuid

cmapDir

dockerButton

dockFile

undockFile

end % properties

methods

%% Constructor

function obj = BaseView(parent, title, cmapDir)

% parent is the grid from NextGenWorkspace

obj.parent = parent;

obj.title = title;

obj.cmapDir = cmapDir;

randomUUID = java.util.UUID.randomUUID;

obj.uuid = randomUUID.toString;

% start with a panel so I can get a nice outline. NOTE that

% even though HighlightColor is a property of uipanel, it only

% works when the parent is a figure (not a uifigure)

obj.borderPane = uipanel(obj.parent, ...

'BorderType', 'line', ...

'UserData', obj.uuid, ...

'Tag', title); %, ...

%'HighlightColor', [1 0 0]);

% 2 rows, 1 col

mainGrid = uigridlayout(obj.borderPane, ...

'tag', 'mainGrid');

mainGrid.RowHeight = {50,'1x'};

mainGrid.ColumnWidth= {'1x'};

% create header with title and close button

header = uipanel(mainGrid, ...

'BorderType', 'line', ...

'tag', 'header');

% 1 row, 2 col

hdrGrid = uigridlayout(header, ...

'tag', 'hdrGrid'); %, ...

% 'BackgroundColor',[0.7 0.7 0.7]);

hdrGrid.RowHeight = {33};

hdrGrid.ColumnWidth= {'1x',33,33};

uilabel(hdrGrid,'text',title);

% save icons that potenially can be used repeatedly

obj.dockFile = fullfile(pwd,'resources','arrow-collapse_16.png');

obj.undockFile = fullfile(pwd,'resources','arrow-expand_16.png');

windowCloseFile = fullfile(pwd,'resources','window-close_16.png');

% create dock button

if exist(obj.undockFile,'file') == 0

obj.dockerButton = uibutton(hdrGrid,'Text','>>');

else

obj.dockerButton = uibutton(hdrGrid, ...

'icon', obj.undockFile, ...

'text','');

end

set(obj.dockerButton, 'Tooltip', 'Undock View', ...

'userdata', 'docked=true', ...

'ButtonPushedFcn', @(src,event) dockView (obj,src,event));

% create close button

if exist(windowCloseFile,'file') == 0

obj.exitButton = uibutton(hdrGrid,'text','X');

else

obj.exitButton = uibutton(hdrGrid,'text','', ...

'icon', windowCloseFile);

end

set(obj.exitButton, 'Tooltip', 'Remove View', ...

'ButtonPushedFcn', @(src,event) closeView (obj,src,event));

% now the main workspace area where sub classes will put

% widget

obj.grid = uigridlayout(mainGrid, ...

'tag', 'grid');

obj.grid.RowHeight = {'1x'};

obj.grid.ColumnWidth= {'1x'};

end % function

end % methods

methods (Access = protected)

% callback for the close button

function closeView(obj, ~, ~)

disp ('BaseView::closeView');

end

% pop out the view into its own dialog or return it to its tab

function dockView(obj, ~, ~)

disp ('BaseView::dockView');

end

end % dockView

end % methods

end % classdef

[Deanna Green]

I figured it out. It's an ordering thing. Setting the ButtonPushedFcn callback BEFORE the exitButton was created resulted in me not having access to that button handle in the callback. Once I moved the line where I set my dockerButton callback to after the exitButton has been defined, everything worked as expected.