Android Studio RC 4 ActionBar does not appear in preview

Im creating a new project from 0 but when i see the preview doesnt show any actionBar , im just creating it from 0 i dont have any code,

a Picture: http://i.stack.imgur.com/CaeE1.png

here is my style.xml:


    
    
        
    

And my activity_main.xml:


    

And my MainActivity.java:

package com.example.jorwys.myapplication;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

But when i open a older project the preview does show me the actionbar so i think the problem is the new android studio; Thank you for the help. im sorry about my bad english.

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