Modal dialog with incremental updates

I would like to open a dialog window (from the main window) as follows:

the dialog is "modal" in the sense that, when opened, it prevents the interaction with the main window
after the dialog is shown, I can run a loop that incrementally updates an entry widget in the dialog
at the end of the loop, the dialog can be closed by the user from a button, then the control returns to the main window
Is it possible with LuaRT ? Is there an example?

Yes you can use Window.showmodal() for this : [Login to see the link]

There is an example in this documentation link