inherited form problem with access to ancestor object

I have a form A:Formb

form A has a custom control  myUC which has internal properties and members Ican access from form A
 public virtual void setDisplay(){ }
 internal Dictionary<string,int> optionList = new Dictionary<string,int>();
 internal ListBox optionLbx=new ListBox();

then in windows application mainform

I declared

public class mydlg:A()
{
	public override setDisplay()
	{
		optionList.Add("some options name",0);// optionList not exists or defined
		optionList.Addnotheroptions name",1);
		optionList.Add("some options name",0);
		optionLbx.DataSource = optionList;// got flagged as not exists or defined
	}
}

what did i do wrong?