How to add data to an existing UITable in app designer?

Data is loaded to UITable from an Excel file with startupfcn, then some more data is needed to be written to the same UITable. When l try to add more data, the previous data vanishes. l am looking for something like in writematrix('WriteMode','append').

Answer 1

[Voss]

old_data = app.UITable.Data;
app.UITable.Data = [old_data; new_data];