Fetch child's identifier from the accessible tree as an IAccessible and enumerate whole accesibility tree.

```csharp Queue queue = new Queue();
queue.Enqueue(accessible);

while (queue.Count != 0)
{
IAccessible accessNode = queue.Dequeue();
_accesibleTree.Add(accessNode);
if (accessNode != null)
{
for (int i = 1; i <= accessNode.accChildCount; i++)
{
object child = accessNode.accChild[i];

if (child is IAccessible childAccessible)
{
queue.Enqueue(childAccessible);
}
else if (child != null)
{
// Handle the situation where the child is not IAccessible
}
}
}
}``` How to access the child from here?