diff --git a/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm b/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm
index 1f71da7f2..595a89a59 100644
--- a/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm
+++ b/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm
@@ -4,7 +4,7 @@ use warnings;
 use utf8;
 
 use Wx qw(:misc :sizer :treectrl wxTAB_TRAVERSAL wxSUNKEN_BORDER wxBITMAP_TYPE_PNG);
-use Wx::Event qw(EVT_BUTTON EVT_TREE_ITEM_COLLAPSING);
+use Wx::Event qw(EVT_BUTTON EVT_TREE_ITEM_COLLAPSING EVT_TREE_SEL_CHANGED);
 use base 'Wx::Panel';
 
 use constant ICON_MATERIAL      => 0;
@@ -18,10 +18,8 @@ sub new {
     
     my $object = $self->{model_object} = $params{model_object};
     
-    $self->{sizer} = Wx::BoxSizer->new(wxVERTICAL);
-    
     # create TreeCtrl
-    my $tree = $self->{tree} = Wx::TreeCtrl->new($self, -1, wxDefaultPosition, [-1, 200], 
+    my $tree = $self->{tree} = Wx::TreeCtrl->new($self, -1, wxDefaultPosition, [200, 200], 
         wxTR_NO_BUTTONS | wxSUNKEN_BORDER | wxTR_HAS_VARIABLE_ROW_HEIGHT | wxTR_HIDE_ROOT
         | wxTR_MULTIPLE | wxTR_NO_BUTTONS);
     {
@@ -33,7 +31,8 @@ sub new {
         
         my $rootId = $tree->AddRoot("");
         my %nodes = ();  # material_id => nodeId
-        foreach my $volume (@{$object->volumes}) {
+        foreach my $volume_id (0..$#{$object->volumes}) {
+            my $volume = $object->volumes->[$volume_id];
             my $material_id = $volume->material_id;
             $material_id //= '_';
             
@@ -42,19 +41,49 @@ sub new {
             }
             my $name = $volume->modifier ? 'Modifier mesh' : 'Solid mesh';
             my $icon = $volume->modifier ? ICON_MODIFIERMESH : ICON_SOLIDMESH;
-            $tree->AppendItem($nodes{$material_id}, $name, $icon);
+            my $itemId = $tree->AppendItem($nodes{$material_id}, $name, $icon);
+            $tree->SetItemData($itemId, {
+                type        => 'volume',
+                volume_id   => $volume_id,
+            });
         }
         $tree->ExpandAll;
     }
+    
+    # left pane with tree
+    my $left_sizer = Wx::BoxSizer->new(wxVERTICAL);
+    $left_sizer->Add($tree, 0, wxEXPAND | wxALL, 10);
+    
+    # right pane with preview canvas
+    my $canvas = $self->{canvas} = Slic3r::GUI::PreviewCanvas->new($self, $self->{model_object});
+    $canvas->SetSize([500,500]);
+    
+    $self->{sizer} = Wx::BoxSizer->new(wxHORIZONTAL);
+    $self->{sizer}->Add($left_sizer, 0, wxEXPAND | wxALL, 0);
+    $self->{sizer}->Add($canvas, 1, wxEXPAND | wxALL, 0);
+    
+    $self->SetSizer($self->{sizer});
+    $self->{sizer}->SetSizeHints($self);
+    
+    # attach events
     EVT_TREE_ITEM_COLLAPSING($self, $tree, sub {
         my ($self, $event) = @_;
         $event->Veto;
     });
+    EVT_TREE_SEL_CHANGED($self, $tree, sub {
+        my ($self, $event) = @_;
+        
+        my $nodeId = $tree->GetSelection;
+        printf "nodeId = %s\n", $nodeId;
+        my $itemData = $tree->GetItemData($nodeId);
+        if ($itemData && $itemData->{type} eq 'volume') {
+            $canvas->volumes->[ $itemData->{volume_id} ]{selected} = 1;
+        } else {
+            $_->{selected} = 0 for @{$canvas->volumes};
+        }
+    });
     
-    $self->{sizer}->Add($tree, 0, wxEXPAND | wxALL, 10);
     
-    $self->SetSizer($self->{sizer});
-    $self->{sizer}->SetSizeHints($self);
     return $self;
 }
 
diff --git a/lib/Slic3r/GUI/PreviewCanvas.pm b/lib/Slic3r/GUI/PreviewCanvas.pm
index f66d1c116..7635d33c6 100644
--- a/lib/Slic3r/GUI/PreviewCanvas.pm
+++ b/lib/Slic3r/GUI/PreviewCanvas.pm
@@ -18,6 +18,7 @@ __PACKAGE__->mk_accessors( qw(quat dirty init mview_init
 
 use constant TRACKBALLSIZE => 0.8;
 use constant TURNTABLE_MODE => 1;
+use constant SELECTED_COLOR => [0,1,0];
 use constant COLORS => [ [1,1,1], [1,0.5,0.5], [0.5,1,0.5], [0.5,0.5,1] ];
 
 sub new {
@@ -447,7 +448,11 @@ sub draw_mesh {
         
         glCullFace(GL_BACK);
         glNormalPointer_p($volume->{norms});
-        glColor3f(@{ $volume->{color} });
+        if ($volume->{selected}) {
+            glColor3f(@{ &SELECTED_COLOR });
+        } else {
+            glColor3f(@{ $volume->{color} });
+        }
         glDrawArrays(GL_TRIANGLES, 0, $volume->{verts}->elements / 3);
     }
     
diff --git a/lib/Slic3r/GUI/SimpleTab.pm b/lib/Slic3r/GUI/SimpleTab.pm
index c1fee5439..e820ad45e 100644
--- a/lib/Slic3r/GUI/SimpleTab.pm
+++ b/lib/Slic3r/GUI/SimpleTab.pm
@@ -6,7 +6,7 @@ use utf8;
 use File::Basename qw(basename);
 use List::Util qw(first);
 use Wx qw(:bookctrl :dialog :keycode :icon :id :misc :panel :sizer :window :systemsettings);
-use Wx::Event qw(EVT_BUTTON EVT_CHOICE EVT_KEY_DOWN EVT_TREE_SEL_CHANGED);
+use Wx::Event qw(EVT_BUTTON EVT_CHOICE EVT_KEY_DOWN);
 use base 'Wx::ScrolledWindow';
 
 sub new {