How to open UITable in a new window using an imported text or spreadsheet file

I want to open a uitable using an imported file with app designer. The file will be imported using a button, followed by a few different commands to determine what kind of file it is, followed by a 'readtable' command to actually import the table along with any user defined specifications (opts). I want to the uitable to be opened in a new window because there is too much data to display on the front of my app. I have tried serval different methods to do this but have had no success. I'm copying my code for the function when the button is pushed (which is the most relevant to this). I apologize for not commenting out my code very well.

% Button pushed function: SelectFileButton
        function SelectFileButtonPushed(app, event)
            app.CheckFileEditField.Value = ' ';
            app.WarningLabel.Text = ' ';
            if contains(app.InFilePathName, '.')        %checking for period('.') in filename.
                index = strfind(app.InFilePathName,'.');
                FileExtension = app.InFilePathName(index(end)+1:end);
                ValidSpreadsheetExtensions={'xlsx', 'xls', 'xlsm', 'xlsb', 'xltx', 'xltm','ods'};
                if ismember(FileExtension,ValidSpreadsheetExtensions)
                    app.CheckFileEditField.Value = 'Proper File';
                    FileType = 'spreadsheet';
                    VariableNamesRange=strcat('A',num2str(app.NumHeaderLinesEditField.Value+1));
                    app.opts = detectImportOptions(app.InFilePathName,'FileType',FileType,'VariableNamesRange',VariableNamesRange,'Sheet',app.SheetToImportEditField.Value,'PreserveVariableNames',true);
                else
                    app.CheckFileEditField.Value = 'Improper File';
                    FileType='text';  %'text';
                    app.opts = detectImportOptions(app.InFilePathName,'FileType',FileType,'PreserveVariableNames',true);
                end 
                my_table = readtable(app.InFilePathName,app.opts);
                app.UITable.Data = my_table;
                %fig = figure; 
                %uit = handles.UITable;
                %uit(fig);
                %newFig = figure(); 
                %copyobj(app.UITable, newFig); 
            else 
                app.WarningLabel.Text = {'*Warning: Incorrect file name format'}; %send this warning if filename does not contain a period.
            end
        end

Answer 1

[Cris LaPierre]

Here's some example code that works for me.

vals=readtable("datafile.csv");
fig = uifigure;
uit = uitable(fig,'Data',vals);
uit.Position = [0 0 500 400];

You can control aspects of the table's appearance by modifying table properties (colum width, column headers, etc).

[Forrest Ward]

Thank you so much! That worked perfectly!