Matlab GUI with activexcontrol Drop Down updates with Push button

Hello, I am having such a hard time with getting an activexcontrol GUI to work. I am trying to make it so that a drop down selects from different items in a struct. This part is working. I am able to add an additional entry into the struct by pressing a button, but I don't really understand the code I made (edited several different example codes together). Also, the struct is not reloading into the popupbox when the button is pressed? Thanks, Sarah

    function [] = GUI_22()

%Load transducer data and permute to correct form.
load transducer.mat
transducercell = struct2cell(transducer);

%Get the different categories of data seperately
names = permute(transducercell(1,:,:),[3 2 1])
bandwidth = permute(transducercell(2,:,:),[3 2 1])
numpts = permute(transducercell(3,:,:),[3 2 1])
low_freq = permute(transducercell(4,:,:),[3 2 1])
high_freq = permute(transducercell(5,:,:),[3 2 1])

names = names';
bandwidth = bandwidth';
numpts = numpts';
low_freq = low_freq';
high_freq = high_freq';

%Define the GUI figure.
S.fh = figure('units','pixels',...
              'position',[600 650 600 600],...
              'menubar','none',...
              'name','GUI_22',...
              'numbertitle','off',...
              'resize','off');

%Define the popup Menu with prepopulated items from the transducer struct.          
S.pop = uicontrol('style','pop',...
                  'units','pixels',...
                  'position',[100 100 260 40],...
                  'string',names);

%Define the edit boxes that will display the items in the struct that go with each transducer type.          
S.ed = uicontrol('style','edit',...
                 'units','pix',...
                 'position',[50 300 260 30],...
                 'fontsize',16,'string','');
S.ed2 = uicontrol('style','edit',...
                 'units','pix',...
                 'position',[250 300 260 30],...
                 'fontsize',16,'string','');

S.ed3 = uicontrol('style','edit',...
                 'units','pix',...
                 'position',[50 250 260 30],...
                 'fontsize',16,'string','');

S.ed4 = uicontrol('style','edit',...
                 'units','pix',...
                 'position',[ 250 250 260 30],...
                 'fontsize',16,'string','');

S.ed5 = uicontrol('style','edit',...
                 'units','pix',...
                 'position',[ 50 200 260 30],...
                 'fontsize',16,'string','');

%Define the pushbutton to update the struct            
S.pushbutton1 = uicontrol('style','pushbutton',...
     'units','pix',...
     'position',[ 50 150 260 30],...
     'fontsize',16,'string','New Transducer Type');

set([S.pop,S.ed],{'callback'},{{@pp_call,S};{@ed_call_2,S}});
set([S.pop,S.ed2],{'callback'},{{@pp_call,S};{@ed_call_2,S}});
set([S.pop,S.ed3],{'callback'},{{@pp_call,S};{@ed_call_2,S}});
set([S.pop,S.ed4],{'callback'},{{@pp_call,S};{@ed_call_2,S}});
set([S.pop,S.ed5],{'callback'},{{@pp_call,S};{@ed_call,S}});
set([S.pop,S.pusbutton1],{'callback'},{{@pp_call,S};{@pushbutton1_call,S}});

function [] = pp_call(varargin)
% Callback for the popup.
S = varargin{3};  % Get the structure.
P = get(S.pop,{'string','val'});  % Get the users choice.

p_var = P{1,2}

load transducer.mat
transducercell = struct2cell(transducer);

%Get the different categories of data seperately
names = permute(transducercell(1,:,:),[3 2 1])
bandwidth = permute(transducercell(2,:,:),[3 2 1])
numpts = permute(transducercell(3,:,:),[3 2 1])
low_freq = permute(transducercell(4,:,:),[3 2 1])
high_freq = permute(transducercell(5,:,:),[3 2 1])

names = names';
bandwidth = bandwidth';
numpts = numpts';
low_freq = low_freq';
high_freq = high_freq';
bandwidth = bandwidth;
numpts = numpts;
names = names;
low_freq = low_freq;
high_freq = high_freq;

names_selection = names{1,p_var}
num_pts_selection = numpts{1,p_var}
bandwidth_selection = bandwidth{1,p_var}
low_freq_selection = low_freq{1,p_var}
high_freq_selection = high_freq{1,p_var}
numpts_selection = numpts{1,p_var}
    set(S.ed,'string',P{1}{P{2}});  % Assign the user's choice to the edit.
    set(S.ed2,'string',bandwidth_selection);  % Assign the user's choice to the edit.
    set(S.ed3,'string',low_freq_selection);  % Assign the user's choice to the edit.
    set(S.ed4,'string',high_freq_selection);  % Assign the user's choice to the edit.
    set(S.ed5,'string',numpts_selection );  % Assign the user's choice to the edit.

function [] = ed_call(varargin)

% Callback for the edit.
S = varargin{3};  % Get the structure.
E = get(S.ed,'string');  % Get the string from the edit.
P = get(S.pop,{'string','value'});  % Get the users choice.
% Check if edit string is found in pop-up list.
tmp = strmatch(E,P{1});

if ~isempty(tmp)
    set(S.pop,'value',tmp)  % Set the pop-up to match the edit.
else
    % We could add the new element to the popup string at either the top or
    % the bottom.  Both methods are shown below.  Only uncomment one of
    % these at a time!
    %Get the different categories of data seperately
    load transducer.mat
    transducercell = struct2cell(transducer);
    names = permute(transducercell(1,:,:),[3 2 1])
    bandwidth = permute(transducercell(2,:,:),[3 2 1])
    numpts = permute(transducercell(3,:,:),[3 2 1])
    low_freq = permute(transducercell(4,:,:),[3 2 1])
    high_freq = permute(transducercell(5,:,:),[3 2 1])

      names = names';
      bandwidth = bandwidth';
      numpts = numpts';
      low_freq = low_freq';
      high_freq = high_freq';
      bandwidth = bandwidth;
      numpts = numpts;
      names = names;
      low_freq = low_freq;
      high_freq = high_freq;

      %First add the new row to the struct
      num = length(names)
      num_plus_1 = num +1

      %Get the edit boxes info
      e1 = get(S.ed,{'string','val'})
      e2 = get(S.ed2,{'string','val'})
      e3 = get(S.ed3,{'string','val'})
      e4 = get(S.ed4,{'string','val'})
      e5 = get(S.ed5,{'string','val'})

      S = guidata(gcbf);  % Get the structure.
      %set(S.tx,'str',get(S.ed,'string'));  
      S.STR = [];
      guidata(gcbf,S)

      %Update the transducer struct and resave the transducer struct.
      transducer(num_plus_1).name = e1{1,1}
      transducer(num_plus_1).bandwidth = e2{1,1}
      transducer(num_plus_1).low_freq = e3{1,1}
      transducer(num_plus_1).high_freq = e4{1,1}
      transducer(num_plus_1).numpts = e5{1,1}
      save('transducer.mat','transducer');
      load transducer.mat

      set(S.pop,'string',{P{1}{:},E},'value',length(P{1})+1) % Bottom
  end

% % 
function [] = ed2_call(varargin)
% Callback for editbox.
S = guidata(gcbf);  % Get the structure.
set(S.tx,'str',get(S.ed2,'string'));  
S.STR = [];
guidata(gcbf,S)

function [] = ed3_call(varargin)
% Callback for editbox.
S = guidata(gcbf);  % Get the structure.
set(S.tx,'str',get(S.ed3,'string'));  
S.STR = [];
guidata(gcbf,S)

function [] = ed4_call(varargin)
% Callback for editbox.
S = guidata(gcbf);  % Get the structure.
set(S.tx,'str',get(S.ed4,'string'));  
S.STR = [];
guidata(gcbf,S)

function [] = ed5_call(varargin)
% Callback for editbox.
S = guidata(gcbf);  % Get the structure.
set(S.tx,'str',get(S.ed5,'string'));  
S.STR = [];
guidata(gcbf,S)

function [] = ed_kpfcn(H,E)
% Keypressfcn for editbox
S = guidata(gcbf);  % Get the structure.
if strcmp(E.Key,'backspace')
    S.STR = S.STR(1:end-1);
elseif isempty(E.Character)
    return
else
    S.STR = [S.STR E.Character];
end
set(S.tx,'string',S.STR)
guidata(gcbf,S)

function [] = pushbutton_call(varargin)

% Callback for the popup.
S = varargin{3};  % Get the structure.
P = get(S.pop,{'string','val'});  % Get the users choice.

p_var = P{1,2}

load transducer.mat
transducercell = struct2cell(transducer);

%Get the different categories of data seperately
names = permute(transducercell(1,:,:),[3 2 1])
bandwidth = permute(transducercell(2,:,:),[3 2 1])
numpts = permute(transducercell(3,:,:),[3 2 1])
low_freq = permute(transducercell(4,:,:),[3 2 1])
high_freq = permute(transducercell(5,:,:),[3 2 1])

names = names';
bandwidth = bandwidth';
numpts = numpts';
low_freq = low_freq';
high_freq = high_freq';
bandwidth = bandwidth;
numpts = numpts;
names = names;
low_freq = low_freq;
high_freq = high_freq;

num_pts_selection = numpts{1,p_var}
bandwidth_selection = bandwidth{1,p_var}
low_freq_selection = low_freq{1,p_var}
high_freq_selection = high_freq{1,p_var}
numpts_selection = numpts{1,p_var}
    set(S.ed,'string',P{1}{P{2}});  % Assign the user's choice to the edit.
    set(S.ed2,'string',bandwidth_selection);  % Assign the user's choice to the edit.
    set(S.ed3,'string',low_freq_selection);  % Assign the user's choice to the edit.
    set(S.ed4,'string',high_freq_selection);  % Assign the user's choice to the edit.
    set(S.ed5,'string',numpts_selection );  % Assign the user's choice to the edit.

function [] = pushbutton1_call(varargin)
% Callback for the edit.
S = varargin{3};  % Get the structure.
E = get(S.ed,'string');  % Get the string from the edit.
P = get(S.pop,{'string','value'});  % Get the users choice.
% Check if edit string is found in pop-up list.
tmp = strmatch(E,P{1});

% set(S.ed,'str',get(S.ed,'string'));  
% set(S.ed2,'str',get(S.ed2,'string'));  
% set(S.ed3,'str',get(S.ed3,'string'));  
% set(S.ed4,'str',get(S.ed4,'string'));  
% set(S.ed5,'str',get(S.ed5,'string'));  

if ~isempty(tmp)
    set(S.pop,'value',tmp)  % Set the pop-up to match the edit.
else
    % We could add the new element to the popup string at either the top or
    % the bottom.  Both methods are shown below.  Only uncomment one of
    % these at a time!
    %Get the different categories of data seperately

      load transducer.mat
      transducercell = struct2cell(transducer);

      names = permute(transducercell(1,:,:),[3 2 1])
      bandwidth = permute(transducercell(2,:,:),[3 2 1])
      numpts = permute(transducercell(3,:,:),[3 2 1])
      low_freq = permute(transducercell(4,:,:),[3 2 1])
      high_freq = permute(transducercell(5,:,:),[3 2 1])

      names = names';
      bandwidth = bandwidth';
      numpts = numpts';
      low_freq = low_freq';
      high_freq = high_freq';

      %First add the new row to the struct
      num = length(names)
      num_plus_1 = num +1

      %Get the edit boxes info
      e1 = get(S.ed,{'string','val'})
      e2 = get(S.ed2,{'string','val'})
      e3 = get(S.ed3,{'string','val'})
      e4 = get(S.ed4,{'string','val'})
      e5 = get(S.ed5,{'string','val'})

      S = guidata(gcbf);  % Get the structure.
      %set(S.tx,'str',get(S.ed,'string'));  
      S.STR = [];
      guidata(gcbf,S)

      %Update the transducer struct and resave the transducer struct.
      transducer(num_plus_1).name = e1
      transducer(num_plus_1).bandwidth = e2
      transducer(num_plus_1).low_freq = e3
      transducer(num_plus_1).high_freq = e4
      transducer(num_plus_1).numpts = e5
      save('transducer.mat','transducer');
      load transducer.mat

      set(S.pop,'string',{P{1}{:},E},'value',length(P{1})+1) % Bottom
  %     set(S.pop,'string',{E,P{1}{:}},'value',1) % Top   
  end