How to Android Holo Theme style dialog box buttons

I'm creating a Dialog Box on Holo Theme and want to follow the OS default way of displaying the buttons. So far I have created the dialog box but the buttons don't render in the way it does in the apps done in Holo for ICS. How can I do this? My intended look & feel is and I am able to reach till here

a bit late, but maybe someone is still interested in that.

this works pretty good for me.

...
<!--
EDIT: be carefull, "?android:attr/dividerHorizontal" is only supported since API 11
      just avoid it in prior OSs.
-->
<View
    android:layout_width="fill_parent"
    android:layout_height="1dip"
    android:background="?android:attr/dividerHorizontal" />
<LinearLayout 
    style="?android:attr/buttonBarStyle"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:paddingTop="0dip"
    android:paddingLeft="2dip"
    android:paddingRight="2dip"
    android:measureWithLargestChild="true">

    <Button 
        android:id="@+id/cancel"
        style="?android:attr/buttonBarButtonStyle"
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="@android:string/cancel"/>
    <Button 
        android:id="@+id/ok"
        style="?android:attr/buttonBarButtonStyle"
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="@android:string/ok"/>
</LinearLayout>
...

the activity that loads this layout needs the Holo.Dialog theme.

android:theme="@android:style/Theme.Holo.Dialog"

This is what works:

<LinearLayout
    android:id="@+id/buttonHolder"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" 
    android:orientation="horizontal"
    >

    <Button
        android:id="@+id/cmdSignup"
        style="@android:style/Widget.Holo.Light.Button.Borderless.Small"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="@string/Signup" />

    <Button
        android:id="@+id/cmdLogin"
        style="@android:style/Widget.Holo.Light.Button.Borderless.Small"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="@string/Login" />
</LinearLayout>

The property style="@android:style/Widget.Holo.Light.Button.Borderless.Small" gives the flat look and feel, and the 50% weight distribution is because of combining 100$ sizing of LinearLayout by android:layout_width="match_parent" andandroid:layout_weight="1"`for buttons