Unfortunately, this specific scenario is not supported yet by current build of WebGrid 7.

You can submit this as feature request to WebGrid development team. The team will check the feasibility to implement this feature on the next build of WebGrid7.

Yudi, thank you for your reply.

Maybe there's a js workaround that I can apply?

Please try to use the Javascript workaround below in order to disable the chart filtering. The idea is simple, find and get the element that wish to be removed and set its display property to ‘none’. After do several debug and test on WebGrid, I found that the Javascript function can be attached in OnBeforeRequest of WebGrid client-side event.

function WebGrid1_OnBeforeRequest(controlId, action) {
    var WebGrid1 = ISGetObject(controlId);

    if (action == "RetrievePivotData") {
        for (var i = 0; i <= 1; i++) {
            if (document.getElementById("ISPopup_" + i) != null) {
                document.getElementById("ISPopup_" + i).childNodes[0].childNodes[0].
                    childNodes[0].childNodes[2].style.display = "none";
                document.getElementById("ISPopup_" + i).childNodes[0].childNodes[0].
                    childNodes[0].childNodes[3].style.display = "none";
                document.getElementById("ISPopup_" + i).childNodes[0].childNodes[0].
                    childNodes[0].childNodes[4].style.display = "none";
            }
        }
    }

    return true;
}

Please let us know whether it helps or not.