Navigation Drawer and SurfaceView in fragment

I want to use SurfeceView to make simple painting app like MS Paint. I created main activity with navigation drawer as toolbox for painting tools. I assumed that user I can operate on many surfaces (pages) so I made for each page separate fragment with SurfaceView inside.

In main activity I made customized button to open drawer. In fragment I set mSurfaceView.setZOrderOnTop(true) for SurfaveView and in SurfaceView mHolder.setFormat(PixelFormat.TRANSLUCENT)

Fragment layout:

<?xml version="1.0" encoding="utf-8"?>
<it.controls.PaintPageLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="20dp"
    android:background="#e0aa66cc"
    android:visibility="visible">
    <Button
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:text="Sv"
        android:textSize="12sp"
        android:padding="0dp"
        android:background="#ffff4444"
        android:textColor="@android:color/black"
        android:minWidth="40dp"
        android:id="@+id/surface_fragment_debug_save" />
    <TextView
        android:id="@+id/surface_fragment_debug_info"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="end"
        android:text="debug_info"
        android:textColor="@android:color/white"
        android:background="@android:color/transparent"
        android:visibility="visible"
        android:layout_toEndOf="@+id/surface_fragment_debug_save" />
</RelativeLayout>
<it.controls.PaintSurfaceView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/surface_fragment_surface"
    />

Main layout is almost standard template generated from Android Studio, expect that my app is full screen (doesn't have Toolbar)

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
   <!-- The main content view -->
<android.support.design.widget.CoordinatorLayout
    android:id="@+id/main_coordinate_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <FrameLayout
        android:id="@+id/fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
    <!-- button to show left menu -->
    <android.support.v7.widget.AppCompatImageButton
        android:id="@+id/toolbox_toggle_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/toolbox_show_margin"
        android:layout_marginLeft="@dimen/toolbox_show_margin"
        android:contentDescription="@string/menu_show_hide_menu"
        android:src="@drawable/ic_menu_black_48dp"
        android:minWidth="@dimen/toolbox_show_button_size"
        android:minHeight="@dimen/toolbox_show_button_size"
        android:scaleType="fitCenter"
        android:background="@drawable/toolbox_new_page_button_border"
        />
</android.support.design.widget.CoordinatorLayout>
<!-- The navigation drawer -->
<FrameLayout
    android:id="@+id/menu_container"
    android:layout_width="@dimen/nav_drawer_width"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:orientation="horizontal"
    android:layout_gravity="start"
    tools:ignore="UselessParent">
</FrameLayout>
</android.support.v4.widget.DrawerLayout>

When I coded that I made simple drawing mechanism to draw path in SurfaceView and there is a problem.

My problem is that after I draw path I would like to change color so I must open toolbox (drawer). After I open drawer I saw that path is painted ON drawer as on screen below.

What I made wrong? How to hide SurfaceView behind drawer?