diff --git a/src/devicewidget.cc b/src/devicewidget.cc
index 18d6714..b4cf9dd 100644
--- a/src/devicewidget.cc
+++ b/src/devicewidget.cc
@@ -32,9 +32,15 @@
 
 /*** DeviceWidget ***/
 DeviceWidget::DeviceWidget(BaseObjectType* cobject, const Glib::RefPtr<Gtk::Builder>& x) :
-    MinimalStreamWidget(cobject, x),
+    MinimalStreamWidget(cobject),
     offsetButtonEnabled(false) {
 
+    /* MinimalStreamWidget member variables. */
+    x->get_widget("deviceChannelsVBox", channelsVBox);
+    x->get_widget("deviceNameLabel", nameLabel);
+    x->get_widget("deviceBoldNameLabel", boldNameLabel);
+    x->get_widget("deviceIconImage", iconImage);
+
     x->get_widget("lockToggleButton", lockToggleButton);
     x->get_widget("muteToggleButton", muteToggleButton);
     x->get_widget("defaultToggleButton", defaultToggleButton);
@@ -76,6 +82,8 @@ DeviceWidget::DeviceWidget(BaseObjectType* cobject, const Glib::RefPtr<Gtk::Buil
 void DeviceWidget::init(MainWindow* mainWindow, Glib::ustring deviceType) {
     mpMainWindow = mainWindow;
     mDeviceType = deviceType;
+
+    MinimalStreamWidget::init();
 }
 
 void DeviceWidget::setChannelMap(const pa_channel_map &m, bool can_decibel) {
diff --git a/src/minimalstreamwidget.cc b/src/minimalstreamwidget.cc
index 02c6e4a..017b2ed 100644
--- a/src/minimalstreamwidget.cc
+++ b/src/minimalstreamwidget.cc
@@ -25,23 +25,31 @@
 #include "minimalstreamwidget.h"
 
 /*** MinimalStreamWidget ***/
-MinimalStreamWidget::MinimalStreamWidget(BaseObjectType* cobject, const Glib::RefPtr<Gtk::Builder>& x) :
+MinimalStreamWidget::MinimalStreamWidget(BaseObjectType* cobject) :
     Gtk::VBox(cobject),
+    channelsVBox(NULL),
+    nameLabel(NULL),
+    boldNameLabel(NULL),
+    iconImage(NULL),
     peakProgressBar(),
     lastPeak(0),
     peak(NULL),
     updating(false),
     volumeMeterEnabled(false),
     volumeMeterVisible(true) {
+}
 
-    x->get_widget("channelsVBox", channelsVBox);
-    x->get_widget("nameLabel", nameLabel);
-    x->get_widget("boldNameLabel", boldNameLabel);
-    x->get_widget("iconImage", iconImage);
+void MinimalStreamWidget::init() {
+    /* Set up the peak meter. This is not done in the constructor, because
+     * channelsVBox is initialized by the subclasses, so it's not yet available
+     * in the constructor. */
 
     peakProgressBar.set_size_request(-1, 10);
     channelsVBox->pack_end(peakProgressBar, false, false);
 
+    /* XXX: Why is the peak meter hidden by default? Maybe the idea is that if
+     * setting up the monitoring stream fails for whatever reason, then we
+     * shouldn't show the peak meter at all. */
     peakProgressBar.hide();
 }
 
diff --git a/src/minimalstreamwidget.h b/src/minimalstreamwidget.h
index e4f7e19..e5d774c 100644
--- a/src/minimalstreamwidget.h
+++ b/src/minimalstreamwidget.h
@@ -25,11 +25,15 @@
 
 class MinimalStreamWidget : public Gtk::VBox {
 public:
-    MinimalStreamWidget(BaseObjectType* cobject, const Glib::RefPtr<Gtk::Builder>& x);
+    MinimalStreamWidget(BaseObjectType* cobject);
 
+    /* Subclass constructors are expected to initialize these variables.
+     * MinimalStreamWidget can't initialize these, because the glade object
+     * id's depend on the subclass type. */
     Gtk::VBox *channelsVBox;
     Gtk::Label *nameLabel, *boldNameLabel;
     Gtk::Image *iconImage;
+
     Gtk::ProgressBar peakProgressBar;
     double lastPeak;
     pa_stream *peak;
@@ -45,6 +49,11 @@ public:
     void updatePeak(double v);
     void setVolumeMeterVisible(bool v);
 
+protected:
+    /* Subclasses must call this after the constructor to finalize the initial
+     * layout. */
+    virtual void init();
+
 private :
     bool volumeMeterVisible;
 
diff --git a/src/pavucontrol.glade b/src/pavucontrol.glade
index a9c86b2..c8497a1 100644
--- a/src/pavucontrol.glade
+++ b/src/pavucontrol.glade
@@ -222,7 +222,7 @@
                     <property name="can_focus">False</property>
                     <property name="spacing">6</property>
                     <child>
-                      <object class="GtkImage" id="iconImage">
+                      <object class="GtkImage" id="deviceIconImage">
                         <property name="visible">True</property>
                         <property name="can_focus">False</property>
                         <property name="stock">gtk-missing-image</property>
@@ -238,7 +238,7 @@
                         <property name="visible">True</property>
                         <property name="can_focus">False</property>
                         <child>
-                          <object class="GtkLabel" id="boldNameLabel">
+                          <object class="GtkLabel" id="deviceBoldNameLabel">
                             <property name="visible">True</property>
                             <property name="can_focus">False</property>
                             <property name="use_markup">True</property>
@@ -250,7 +250,7 @@
                           </packing>
                         </child>
                         <child>
-                          <object class="GtkLabel" id="nameLabel">
+                          <object class="GtkLabel" id="deviceNameLabel">
                             <property name="visible">True</property>
                             <property name="can_focus">False</property>
                             <property name="xalign">0</property>
@@ -393,7 +393,7 @@
                   </packing>
                 </child>
                 <child>
-                  <object class="GtkVBox" id="channelsVBox">
+                  <object class="GtkVBox" id="deviceChannelsVBox">
                     <property name="visible">True</property>
                     <property name="can_focus">False</property>
                     <property name="spacing">6</property>
@@ -1437,7 +1437,7 @@
                     <property name="can_focus">False</property>
                     <property name="spacing">6</property>
                     <child>
-                      <object class="GtkImage" id="iconImage">
+                      <object class="GtkImage" id="streamIconImage">
                         <property name="visible">True</property>
                         <property name="can_focus">False</property>
                         <property name="stock">gtk-missing-image</property>
@@ -1454,7 +1454,7 @@
                         <property name="can_focus">False</property>
                         <property name="spacing">2</property>
                         <child>
-                          <object class="GtkLabel" id="boldNameLabel">
+                          <object class="GtkLabel" id="streamBoldNameLabel">
                             <property name="visible">True</property>
                             <property name="can_focus">False</property>
                             <property name="use_markup">True</property>
@@ -1466,7 +1466,7 @@
                           </packing>
                         </child>
                         <child>
-                          <object class="GtkLabel" id="nameLabel">
+                          <object class="GtkLabel" id="streamNameLabel">
                             <property name="visible">True</property>
                             <property name="can_focus">False</property>
                             <property name="xalign">0</property>
@@ -1583,7 +1583,7 @@
                   </packing>
                 </child>
                 <child>
-                  <object class="GtkVBox" id="channelsVBox">
+                  <object class="GtkVBox" id="streamChannelsVBox">
                     <property name="visible">True</property>
                     <property name="can_focus">False</property>
                     <property name="spacing">6</property>
diff --git a/src/streamwidget.cc b/src/streamwidget.cc
index 6085550..1682a70 100644
--- a/src/streamwidget.cc
+++ b/src/streamwidget.cc
@@ -30,9 +30,15 @@
 
 /*** StreamWidget ***/
 StreamWidget::StreamWidget(BaseObjectType* cobject, const Glib::RefPtr<Gtk::Builder>& x) :
-    MinimalStreamWidget(cobject, x),
+    MinimalStreamWidget(cobject),
     mpMainWindow(NULL) {
 
+    /* MinimalStreamWidget member variables. */
+    x->get_widget("streamChannelsVBox", channelsVBox);
+    x->get_widget("streamNameLabel", nameLabel);
+    x->get_widget("streamBoldNameLabel", boldNameLabel);
+    x->get_widget("streamIconImage", iconImage);
+
     x->get_widget("lockToggleButton", lockToggleButton);
     x->get_widget("muteToggleButton", muteToggleButton);
     x->get_widget("directionLabel", directionLabel);
@@ -55,6 +61,8 @@ StreamWidget::StreamWidget(BaseObjectType* cobject, const Glib::RefPtr<Gtk::Buil
 
 void StreamWidget::init(MainWindow* mainWindow) {
     mpMainWindow = mainWindow;
+
+    MinimalStreamWidget::init();
 }
 
 bool StreamWidget::onContextTriggerEvent(GdkEventButton* event) {