Hiding an inherited class

Question

 
 
 

public class ABC : WebPart

{

protected virtual void A()
{
//Do nothing
;
}
protected virtual void B()
{
//Do nothing
;
}
protected virtual void C()
{
//Do nothing
;
}

}

public class DEF : ABC

{

public D()
{
}
public E()
{
}
public F()
{
}

}

I have the two classes above. How can I hide the base class from the object browser?