Drag and change the size of UIpanel within an app, developed using app designer

Hi,

I would like to create two panels. And provide the option of a divider, which will help in resizing the panel with mouse drag.

For example UISpliPane, this is exactly what I want, but to implement in the app .For sure, the latest app designer has the feature of auto-reflow , but that's not something I'm looking for or enough for me. I'll be glad if someone provides me with a demo app .

warm regards

Avra