​@mos11  what are you trying to do here exactly? 

It seems you refresh the grid on changing tabs, but why do you even need it? 

Seems like that’s something that should not require any custom javascript/typescript.

@Dmitrii Naumov In the classic UI, this will be a problem when the screen is opened from a Generic Inquiry or other places. But now in the Modern UI, I need to test it.

​@mos11 ,
Example pattern using @handleEvent.

import { PXScreen, PXView, handleEvent } from "client-controls";

export class SO301000_Extension extends PXScreen {

    CustGridTotal = new PXView();

    @handleEvent("screenLoad")
    onScreenLoad() {
        if (this.CustGridTotal) {
            this.CustGridTotal.refresh();
            console.log("custGridTotal refreshed");
        }
    }
}

If You Want It When a Tab Opens

Modern UI does not expose TabChanging, but you can detect tab activation using:

@handleEvent("viewActivated", { view: "CustGridTotal" })
onGridActivated() {
    this.CustGridTotal.refresh();
}

you can try like this code hope work for classic and modern UI.
protected void _(Events.RowSelected<YourDAC> e)
{
    if (Base.CustGridTotal != null)
    {
        Base.CustGridTotal.View.RequestRefresh();
    }
}