ExpandableListView with RadioButtons. Choose a value for one radio group, choose a few more when the group expands

I am replicating a validation form for a piece of hardware in an android app. There is an ExpandableListView where the group data is composed of different machine and child data systems, contains an item checklist with a RadioGroup for technicians to indicate the pass / fail status of an item. Everything works fine, except that when choosing a value for a RadioButton in one child, it selects a value for the same RadioButton in other groups. Therefore, if I had:

Group 1
  Question 1
    Passed
    Failed
    Corrected
    NA
  Question 2
    Passed
    Failed
    Corrected
    NA
Group 2
  Question 1
    Passed
    Failed
    Corrected
    NA
  Question 2
    Passed
    Failed
    Corrected
    NA

      

        
        
        
      

    

If I select Sent in both questions in group 1 without going to group 2, expanding 1 or both of RadioGroups will also select Missed.

The layout I am using to create a child group with RadioGroup looks like

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginLeft="15dip">
<TextView
android:id="@+id/questionText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<RadioGroup
android:tag="actionGroup"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<RadioButton
  android:tag="passed"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="Passed"/>
<RadioButton
  android:tag="failed"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="Failed"/>
<RadioButton
  android:tag="corrected"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="Corrected"/>
<RadioButton
  android:tag="na"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="NA"/>
</RadioGroup>
</LinearLayout>

      

        
        
        
      

    

BaseExpandableListAdapter Activation

ExpandableListView inspectionQuestions = (ExpandableListView) FindViewById(Android.Resource.Id.List);
inspectionQuestions.SetAdapter(new ExpAdapter(this));

      

        
        
        
      

    

BaseExpandableListAdapter

public class ExpAdapter : BaseExpandableListAdapter
{
    private readonly Context context;
    Questions questions = new Questions();
    private int seed = 1000;

    public ExpAdapter(Context ctx)
    {
        context = ctx;
    }

    public override Object GetChild(int groupPosition, int childPosition)
    {
        return null;
    }

    public override long GetChildId(int groupPosition, int childPosition)
    {
        return 0;
    }

    public override View GetChildView(int groupPosition, int childPosition, bool isLastChild, View convertView, ViewGroup parent)
    {
        if (convertView == null)
        {
            LayoutInflater inflater = (LayoutInflater) context.GetSystemService(Context.LayoutInflaterService);
            convertView = inflater.Inflate(Resource.Layout.inspection_row_2, null);
        }

        int currentID;

        TextView question = (TextView) convertView.FindViewById(Resource.Id.questionText);
        RadioGroup radio = (RadioGroup) convertView.FindViewWithTag("actionGroup");
        radio.Id = seed++;
        RadioButton pass = (RadioButton) convertView.FindViewWithTag("passed");
        pass.Id = seed++;
        RadioButton fail = (RadioButton) convertView.FindViewWithTag("failed");
        fail.Id = seed++;
        RadioButton correct = (RadioButton)convertView.FindViewWithTag("corrected");
        correct.Id = seed++;
        RadioButton na = (RadioButton)convertView.FindViewWithTag("na");
        na.Id = seed++;

        string[][] items = questions.childItems();
        question.Text = items[groupPosition][childPosition];

        return convertView;
    }

    public override int GetChildrenCount(int groupPosition)
    {
        return questions.childItems()[groupPosition].Length;
    }

    public override Object GetGroup(int groupPosition)
    {
        return null;
    }

    public override long GetGroupId(int groupPosition)
    {
        return 0;
    }

    public override View GetGroupView(int groupPosition, bool isExpanded, View convertView, ViewGroup parent)
    {
        if (convertView == null)
        {
            LayoutInflater inflater = (LayoutInflater) context.GetSystemService(Context.LayoutInflaterService);
            convertView = inflater.Inflate(Android.Resource.Layout.SimpleExpandableListItem1, null);
        }

        TextView groupName = (TextView) convertView.FindViewById(Android.Resource.Id.Text1);

        QuestionGrouper grouper = new QuestionGrouper();
        groupName.Text = grouper.groupItems()[groupPosition];

        return convertView;
    }

    public override bool IsChildSelectable(int groupPosition, int childPosition)
    {
        return true;
    }

    public override int GroupCount
    {
        get { return 9; }
    }

    public override bool HasStableIds
    {
        get { return false; }
    }
}

      

        
        
        
      

    

EDITED GetChildView per suggestion:

   public override View GetChildView(int groupPosition, int childPosition, bool isLastChild, View convertView, ViewGroup parent)
    {
        if (convertView == null)
        {
            LayoutInflater inflater = (LayoutInflater) context.GetSystemService(Context.LayoutInflaterService);
            convertView = inflater.Inflate(Resource.Layout.inspection_row_2, null);
        }

        TextView question = (TextView) convertView.FindViewById(Resource.Id.questionText);

        RadioGroup radio = (RadioGroup) convertView.FindViewById(Resource.Id.activityGroup);
        int count = radio.ChildCount;

        if (count == 4)
        {
            return convertView;
        }

        RadioButton pass = new RadioButton(context) {Text = "Passed"};
        RadioButton fail = new RadioButton(context) {Text = "Failed"};
        RadioButton correct = new RadioButton(context) {Text = "Corrected"};
        RadioButton na = new RadioButton(context) {Text = "NA"};

        radio.AddView(pass);
        radio.AddView(fail);
        radio.AddView(correct);
        radio.AddView(na); 

        string[][] items = questions.childItems();
        question.Text = items[groupPosition][childPosition];

        return convertView;
    }