Creating a Dropdown menu by listing the variables from model workspace, editing them in UITable element and then saving back to model workspace

Hello Together,

I am working on an interactive application using App Designer (MATLAB R2017b). I am doing the following sequence of operations:-

1. Listing all the variables from the Model workspace and assigning them in the dropdown menu usinng the following callback function-

            mdlWks = get_param('DummyModel','ModelWorkspace');
            save(mdlWks,'Model_Workspace.mat');
            load Model_Workspace.mat;
            vars = evalin(mdlWks, 'whos');
            cell_array = cell(size(vars));
            for i=1:length(vars)
                cell_array{i} = vars(i).name;
            end
            app.WksVarsDropDown.Items = cell_array;

2. Next, If I click on any of the items from the drop down menu, the value of that item should be displayed in the UITable. Now, having displayed the value of the variable, I want to have te flexibility to edit the value. For this, I am using the following callback function ;-

            mdlWks = get_param('DummyModel','ModelWorkspace');
            vars = evalin(mdlWks, 'whos');
            cell_array = cell(size(vars));
            for i=1:length(vars)
                cell_array{i} = vars(i).name;
            end
            WksVars = app.WksVarsDropDown.Value;
            assignin(mdlWks,'WksVars',WksVars);
            for i = 1 : length(vars)
                switch WksVars
                    case cell_array{i}
                        A = evalin(mdlWks,cell_array{i});
                        paramObj = A.Value;
                        app.UITable2.Data = paramObj;
                        ncols = size(app.UITable2.Data,2);
                        app.UITable2.ColumnEditable = true(1,ncols);
                end
            end
           

3. Having edited the value of one or more variables from the UITable element, I want is to save the changes to model workspace. For saving the model workspace I am using a pushbutton element, callback function for which is mentioned below.

            mdlWks = get_param('DummyModel','ModelWorkspace');
            mdlWks.DataSource = 'MAT-File';
            mdlWks.FileName = 'Parameters_Model_Wks';
            saveToSource(mdlWks);

The model workspace is not getting updated as per the changes, neither it is throwing any waring or error so that I can understand the issue.

I am not able to proceed further. Please guide me on this.

Thanking you in Anticipation!