You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: callback_scTenifoldKnk1.m
    path of file: ./repos/scGEAToolbox/+gui
    
    the code of the file until where you have to start completion: function callback_scTenifoldKnk1(src, ~)

try
    ten.check_tensor_toolbox;
catch ME
    errordlg(ME.message);
    return;
end

extprogname = 'scTenifoldKnk';

    
function callback_scTenifoldKnk1(src, ~)

try
    ten.check_tensor_toolbox;
catch ME
    errordlg(ME.message);
    return;
end

extprogname = 'scTenifoldKnk';
preftagname = 'externalwrkpath';
[wkdir] = gui.gui_setprgmwkdir(extprogname, preftagname);
if isempty(wkdir), return; end
if isfolder(wkdir)
    cd(wkdir);
end
import ten.*

FigureHandle = src.Parent.Parent;
if ~gui.gui_uishowrefinfo('scTenifoldKnk [PMID:35510185]',FigureHandle)
    return;
end
sce = guidata(FigureHandle);

answer = questdlg('Construct network de novo or use existing network in Workspace?', ...
    'Input Network', 'Construct de novo', 'Use existing', 'Construct de novo');
switch answer
    case 'Use existing'
        a = evalin('base', 'whos');
        b = struct2cell(a);
        if isempty(b)
            helpdlg('No variable in the WorkSpace.', '');
            return;
        end