Escape from sandbox: reflection

I have really fun problem. It's kind of sandbox escaping.

Aim: get not public methods of class

What I can:
1) Load standart assemblies by assemblies by long name
2) Use GetType and Type's methods

What I cannot:
1) Use using in code

Looks like I could load private fields like

myType.GetFields(BindingFlags.NonPublic | BindingFlags.Instance);

but I haven't BindingFlags imported in my code.

OK, I could create instance of BindingFlags and use GetField of it, but again it returns Object and I can't cast it to BindingFlags.

I tried Convert.ChangeType method, but Invoke return Objects :)

How could I resolve this issue?