How to set busyIndicator to true when the screen is frozen?

Hi experts,

I would like to "turn off and on" busyIndicator centrally when the screen is frozen, i.e. when the user can't interact with the app.

What event do I need?

I tried setting busyIndicator values at onBeforeRendering & onAfterRendering of my xmlView but the problem is is that the busyIndicator get frozen as well.

Kind regards,

Filip