Cannot reset border of subform?

I am modifying the ColorFieldsValidation JavaScript to handle a situation where I want the entire subform containing any failed fields to be highlighted. The highlighting works well. However, even when the validation is successful, the highlighting persists. I believe I've narrowed it down to line 32, which seems to only remove the bottommost border. I realize this code was originally written to remove borders of fields, but why does it not also work for subforms?

function InitializeColorFields() {    // Disable Acrobat's field highlighting. The Color    // Failed Fields action takes care of highlighting fields.    if (xfa.host.name == "Acrobat") {        app.runtimeHighlight = false;    }
}
function DoColorFields(oInvalidNode) {    // If this form is running on a client other than Acrobat    // (like on the server) then don't run this script    if (xfa.host.name != "Acrobat") {        return;    }    var sClassName = oInvalidNode.className;      // Only contests, so nodes that are <field>s and    // have name "Selected"    // Ignore everything else    if ((sClassName != "field") &&        (oInvalidNode.name != "Selected")) {        return;    }      //get closest Contest    var nearestContest = oInvalidNode.resolveNode("Contest")    if (oInvalidNode.errorText == "") {              // Validation Succeeded        // Revert the appearance to its original state                  console.println("we good for " + oInvalidNode.name);        var oBorder = nearestContest.border;        //does not work!              oBorder.parent.nodes.remove(oBorder);                            }    else {              // Validation Failed        // Show the invalid appearance        var oFailedBorder = nearestContest.border;        // Border color        // Show a solid border with square corners        var sBorderColor;            sBorderColor = "51, 102, 255";          if (sBorderColor != "none") {                  oFailedBorder.presence = "visible";                      for (var i = 0; i < 4; i++) {                var oEdge = oFailedBorder.getElement("edge", i);                              oEdge.presence = "visible";                oEdge.color.value = sBorderColor;                oEdge.thickness = "2pt";                oEdge.stroke = "solid";                              var oCorner = oFailedBorder.getElement("corner", i);                      oCorner.presence = "visible";                oCorner.color.value = sBorderColor;                oCorner.thickness = "2pt";                oCorner.stroke = "solid";                oCorner.join = "square";                oCorner.inverted = "0";                oCorner.radius = "0mm";            }        }        // Background color        // Show a solid fill color        var sFillColor;              sFillColor = "153, 204, 255";        if (sFillColor != "none") {            // The presence of the border must be visible to show the fill.            // Hide the edges when the invalid appearance doesn't include            // changing the border color            if (oFailedBorder.presence != "visible") {                oFailedBorder.presence = "visible";                oFailedBorder.edge.presence = "invisible";            }                      // Replace the current fill type with a solid fill            if (oFailedBorder.fill.oneOfChild.className != "solid") {                var oFailedFillType = oFailedBorder.fill.oneOfChild;                oFailedBorder.fill.nodes.remove(oFailedFillType);                              var oSolid = xfa.form.createNode("solid", "");                          oFailedBorder.fill.nodes.append(oSolid);            }            oFailedBorder.fill.color.value = sFillColor;        }          }
}

An example demonstrating this issue is here: Shared Files - Acrobat.com