how to send Context as a Method's parameter from Activity

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Java

Mobile

Android

Android4x

hi guys . iam working on my project and have a little problem . i'v created a class . this class contains some Methods . one of these methods is used to show a progress Dialog .in fact iv created this class becaus of reuse
. i'd like to use this class from another Activity .like association relationship in oop .
fact : as you know if you hav an object of a class inside another class , these classes have association relationship .
My Class

import android.app.ProgressDialog;
import android.content.Context;
public class MyProgress  {
      ProgressDialog dialog;
      public void showProgBox(Context ctx,String Title, String Txt ){		
	dialog=ProgressDialog.show(ctx, Title, Txt);
	}
       }

but when i use this method from another Activity i get an error
error :
android.view.windowManagerBadTokenException--token null is not for application
Activity's Code :

MyProgress Mp=new MyProgress();
Mp.showProgBox(getBaseContext(), "Loading Box ", "wait...");

i debugged my app . i think the problem is about getBaseContext()
what would you suggest doing ?! thank you ...