How to get a new GUI with components to open after closing another one using a pushbutton?

So I am trying to create a GUI which does something simple, and then when you click submit, it will open up a new GUI and close the original. I have gotten it to do it's simple task, close itself and open up a new GUI... however the pushbutton that I am trying to put in the new GUI is not appearing, and I am getting an error message. I cannot, for the life of me, figure out what I am doing wrong! Here is the code I have:

function matrixinput %Generate the actual window prompt
matrixwindow = figure();
    set(matrixwindow, 'MenuBar', 'none',...
                         'ToolBar', 'none',...
                         'Name','Enter',...
                         'NumberTitle','off',...
                         'Position', [450 450 200 140])
%Generate the main "label" text
    text = uicontrol(matrixwindow, 'Style','text',...
                              'String','Please enter the 2x2 matrix values',...
                              'Position',[0 100 200 30]);
%Add in the text editing fields
    Top_Left = uicontrol('Style', 'edit',...
               'Position',[70 80 25 25]);
    Top_Right = uicontrol('Style', 'edit',...
               'Position',[100 80 25 25]);
    Bottom_Left = uicontrol('Style', 'edit',...
               'Position',[70 50 25 25]);
    Bottom_Right = uicontrol('Style', 'edit',...
               'Position',[100 50 25 25]);
%Add in submit button
    submitbtn = uicontrol(matrixwindow, 'Style','pushbutton',...
                      'String','Submit',...
                      'Position',[50 10 100 30],...
                      'Callback', {@submitbtn_Callback, Top_Left, Top_Right,...
                                    Bottom_Left, Bottom_Right, matrixwindow});
end

function submitbtn_Callback(~, ~, Top_Left, Top_Right, Bottom_Left, Bottom_Right, matrixwindow)
%Collect the input values and define variables:
        a = str2num(get(Top_Left, 'String'));
        b = str2num(get(Top_Right, 'String'));
        c = str2num(get(Bottom_Left, 'String'));
        d = str2num(get(Bottom_Right, 'String'));

%Error message for no name being submitted
    if isempty(a) | isempty(b) | isempty(c) | isempty(d)
        msgbox('Please make sure all fields are properly filled out');
        uiwait(msgbox); %Prevent the program from moving on until a valid name is entered
    end
%Input the values into matrix form:
    A = [a, b; 
         c, d];
     disp('Storing...')
     disp(A)
     disp('...as Matrix A')
%Close first window once the submit button has been pressed...
    close(matrixwindow)
    matrixdisplay = figure(); %...Open new window
        set(matrixdisplay, 'MenuBar', 'none',...
                         'ToolBar', 'none',...
                         'Name','Enter',...
                         'NumberTitle','off',...
                         'Position', [450 450 200 140])
        %Generate the main "label" text
        text = uicontrol(matrixdisplay, 'Style','text',...
                              'String','Please enter the 2x2 matrix values',...
                              'Position',[0 100 200 30]);
        %Add in a test button
        testbtn = uicontrol(matrixdisplay, 'Style','pushbutton',...
                      'String','Test',...
                      'Position',[50 10 100 30],...
                      'Callback', [@testbtn_Callback, matrixdisplay]);
end

function testbtn_Callback(~, ~, matrixdisplay)
    disp('test')
    close(matrixdisplay)
end

When I run this program, everything works fine until the new GUI opens. Here is what is printed in the command window when I run the program, and input the values '1' '2' '3' and '4' into the first GUI prompt:

>> matrix_input
Storing...
     1     2
     3     4

...as Matrix A
Error using matlab.ui.Figure/horzcat
While converting from 'function_handle':
 The conversion returned a value of class 'matlab.mixin.Heterogeneous', which cannot be inserted into an array
 of class 'matlab.ui.Figure'.

Error in matrix_input>submitbtn_Callback (line 63)
                      'Callback', [@testbtn_Callback, matrixdisplay]);

Error while evaluating DestroyedObject Callback

Any ideas one what's going wrong? I'm assuming I'm using the wrong Callback or something for the new button, but I can't seem to figure out what to fix/change.

Answer 1

[Walter Roberson]

                        'Callback', {@testbtn_Callback, matrixdisplay});

You had [] instead of {}