Disable Sub grid

function VisibleGunTransactionEntries() {

var statusreason=Xrm.Page.data.entity.attributes.get("statuscode");

var reason = statusreason.getValue();

if (reason != 170000000) {

var objNavItem = Xrm.Page.ui.navigation.items.get("nav_jmh_jmh_guntransaction_jmh_guntransactionentry_guntransaction");

objNavItem.setVisible(false);

disableSubgrid('subgrid1');

}

}

function disableSubgrid(subgridName) {

document.getElementById(subgridName + "_span").disabled = "true";

}