How to use the editing related events in TreeGridCheckBoxColumn of WinUI TreeGrid?

//Event subscription
this.sfTreeGrid.CurrentCellValueChanged += OnCurrentCellValueChanged;
 
//Event customization
private void OnCurrentCellValueChanged(object sender, TreeGridCurrentCellValueChangedEventArgs e)
{
    int columnindex = sfTreeGrid.ResolveToGridVisibleColumnIndex(e.RowColumnIndex.ColumnIndex);
    if (columnindex < 0) 
        return;
 
    var column = sfTreeGrid.Columns[columnindex];
    if (column is TreeGridCheckBoxColumn)
    {
        var recordIndex = sfTreeGrid.ResolveToNodeIndex(e.RowColumnIndex.RowIndex);
        if (recordIndex < 0)
            return;
        TreeNode node = null;
        if (this.sfTreeGrid.View != null)
        {       
            //Get the TreeNode
            node = this.sfTreeGrid.View.Nodes[recordIndex];
            if (node != null)
            {
               //Checkbox property changed value is stored here.
               var value = (node.Item as EmployeeInfo).Availability;
            }
        }
    }
}