Eu tenho um layout que consiste em dois layouts de quadro, meu primeiro layout de Quadro consiste nos botões e outro layout de Quadro está em branco. No evento click no botão no layout de primeiro quadro, desejo carregar o layout de Atividade no segundo layout de Quadro? Este é o meu XML LAYOUT

    <FrameLayout 
        android:id="@+id/mainframelayout"
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity" >

        <LinearLayout 
            android:id="@+id/mainliner"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:orientation="horizontal"
            android:background="#565765">
        <FrameLayout 
            android:id="@+id/leftlayout"
            android:layout_width="wrap_content"
            android:layout_height="350dp"
            android:layout_marginTop="30dp"
            android:background="#321324">
            <LinearLayout 
                android:id="@+id/liner"
                android:layout_width="wrap_content"
                android:layout_height="fill_parent"
                android:layout_marginTop="50dp"
                android:orientation="vertical">
            <Button 
                android:id="@+id/btn1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="firstButton"
                android:text="A"/>
            <Button 
                android:id="@+id/btn5"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="fifthButton"
                android:text="B"/>
            <Button 
                android:id="@+id/btn2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="secondButton"
                android:text="C"/>
            <Button 
                android:id="@+id/btn3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="thirdButton"           
                android:text="D"/>          
            <Button 
                android:id="@+id/btn4"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="fourthButton"
                android:text="E"/>
            </LinearLayout>                 
        </FrameLayout>
        <FrameLayout 
            android:id="@+id/rightframe"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:background="#565765">

        </FrameLayout>
        </LinearLayout>
    </FrameLayout>