How to remove black border from AlertDialog builder
<p>Actually i have created an custom dialog using AlertDialog.builder.In this dialog i am not displaying the titile.All works fine but there is an black border appear in the dialog.so can anyone tell me how can i remove this black boder.The code and screenshot are below.</p>

<p><strong>code in java:</strong></p>

<pre><code>        AlertDialog.Builder start_dialog = new AlertDialog.Builder(this);

        Context mContext = getApplicationContext();
        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(LAYOUT_INFLATER_SERVICE);
        View layout = inflater.inflate(R.layout.custom_dialog2,
                                       (ViewGroup) findViewById(R.id.layout_root));

        layout.setBackgroundResource(R.drawable.img_layover_welcome_bg);

        Button btnPositiveError = (Button)layout.findViewById(R.id.btn_error_positive);   
        btnPositiveError.setTypeface(m_facedesc);

        start_dialog.setView(layout);

        final AlertDialog alert = start_dialog.create();
        alert.show();

        btnPositiveError.setOnClickListener(new Button.OnClickListener()
        {
            public void onClick(View v) 
            {
                alert.dismiss();
            }
        });
</code></pre>

<p><strong>ScrrenShot</strong></p>

<p><img src="http://i.stack.imgur.com/ZxPWr.png" alt="enter image description here"></p>
