DisplayAllChildAccounts.js

function DisplayAllChildAccounts(executionContext) {
    var formContext = executionContext.getFormContext();
    var accountId = formContext.data.entity.getId();
    var childAccountGridContext = formContext.getControl("ChildAccounts");

    if (childAccountGridContext == null) {
        setTimeout(function () { getAllChildAccounts(executionContext); }, 2000);
    }
    else {
        
        var fetchData = {
            accountid: accountId
        };

        var fetchXml = [
            "<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false'>",
            "  <entity name='account'>",
            "    <attribute name='name' />",
            "    <attribute name='telephone1' />",
            "    <attribute name='address1_city' />",
            "    <attribute name='primarycontactid' />",
            "    <attribute name='statecode' />",
            "    <order attribute='name' descending='false' />",
            "    <filter type='and'>",
            "      <condition attribute='accountid' operator='under' value='", fetchData.accountid, "'/>",
            "    </filter>",
            "  </entity>",
            "</fetch>",
        ].join("");
        
        
        console.group(fetchXml);
        childAccountGridContext.setFilterXml(fetchXml);
        childAccountGridContext.refresh();

    }



}