Radio Buttons in ag-grid - ag-grid

Question

I am using ag-grid to display my data and i have below question:
1.Instead of check boxes i want radio buttons to be displayed when i expand the group and also my grouping is not working as expected.?
Plunkr link for the above grid what i tried so far https://plnkr.co/edit/KahAzPv6QEccaaRKlzCN?p=preview
var gridOptions = {
columnDefs: [
{headerName: "Jobs",field: "job", width: 90,rowGroupIndex: 0 ,hide:true},
// this tells the grid what values to put into the cell
//showRowGroup: 'position'
// this tells the grid what to use to render the cell
// cellRenderer:'agGroupCellRenderer'
//{field: 'position', rowGroup: true, hide: true},
{headerName: "Name", field: "name"}
],
rowData: [
{position:'Developer',name:'Test1',job:'Position'},
{position: 'Manager', name:'Test2',job:'Position'},
{position: 'Musician',job:'Position'},
{position: 'Manager',name:'Test4',job:'Position'},
{position: 'Europe',job:'Location'},
{position: 'Australia',name:'Test4',job:'Location'}
],
/* autoGroupColumnDef:{
headerName:'',
cellRendererParams:{
suppressCount: true,
checkbox:true
}
}*/
autoGroupColumnDef: {
headerName: "Jobs",
field: "position",
width: 250,
cellRenderer:'agGroupCellRenderer',
cellRendererParams: {
checkbox: true
}
}
};