CRM 2011: Hiding Ribbon Button on Click/Select SubGrid using JavaScript.

function OnSubGridClicked() {

    var GridCtrl = document.getElementById("gridname");

    if (GridCtrl == null || GridCtrl.readyState != "complete") {

        setTimeout('OnSubGridClicked()', 1000);

        return;

    }

    else {

        GridCtrl.onload = HideRibbon;

        GridCtrl.onclick = HideRibbon;

        GridCtrl.onfocus = HideRibbon;

    }

}

function HideRibbon() {

    if (window.top.document.getElementById("RibbonId") != null) {

        window.top.document.getElementById("RibbonId").style.display = "none";

        setTimeout(" HideRibbon('"RibbonId"');", 200);

    }

}