diff --git a/lib/Slic3r/GUI/Plater/2DToolpaths.pm b/lib/Slic3r/GUI/Plater/2DToolpaths.pm
index 0a4399490..c80c410ef 100644
--- a/lib/Slic3r/GUI/Plater/2DToolpaths.pm
+++ b/lib/Slic3r/GUI/Plater/2DToolpaths.pm
@@ -52,18 +52,24 @@ sub new {
     });
     EVT_KEY_DOWN($canvas, sub {
         my ($s, $event) = @_;
-        my $key = $event->GetKeyCode;
-        if ($key == ord('D') || $key == WXK_LEFT) {
-            # Keys: 'D' or WXK_LEFT
-            $slider->SetValue($slider->GetValue - 1);
-            $self->set_z($self->{layers_z}[$slider->GetValue]);
-        } elsif ($key == ord('U') || $key == WXK_RIGHT) {
-            # Keys: 'U' or WXK_RIGHT
-            $slider->SetValue($slider->GetValue + 1);
-            $self->set_z($self->{layers_z}[$slider->GetValue]);
-        } elsif ($key >= ord('1') && $key <= ord('3')) {
-            # Keys: '1' to '3'
-            $canvas->set_simulation_mode($key - ord('1'));
+        if ($event->HasModifiers) {
+            $event->Skip;
+        } else {
+            my $key = $event->GetKeyCode;
+            if ($key == ord('D') || $key == WXK_LEFT) {
+                # Keys: 'D' or WXK_LEFT
+                $slider->SetValue($slider->GetValue - 1);
+                $self->set_z($self->{layers_z}[$slider->GetValue]);
+            } elsif ($key == ord('U') || $key == WXK_RIGHT) {
+                # Keys: 'U' or WXK_RIGHT
+                $slider->SetValue($slider->GetValue + 1);
+                $self->set_z($self->{layers_z}[$slider->GetValue]);
+            } elsif ($key >= ord('1') && $key <= ord('3')) {
+                # Keys: '1' to '3'
+                $canvas->set_simulation_mode($key - ord('1'));
+            } else {
+                $event->Skip;
+            }
         }
     });
 
diff --git a/lib/Slic3r/GUI/Plater/3DPreview.pm b/lib/Slic3r/GUI/Plater/3DPreview.pm
index 305f865e4..5663054f1 100644
--- a/lib/Slic3r/GUI/Plater/3DPreview.pm
+++ b/lib/Slic3r/GUI/Plater/3DPreview.pm
@@ -89,20 +89,26 @@ sub new {
     EVT_KEY_DOWN($canvas, sub {
         my ($s, $event) = @_;
         my $key = $event->GetKeyCode;
-        if ($key == ord('U') || $key == WXK_RIGHT) {
-            $slider_high->SetValue($slider_high->GetValue + 1);
-            $slider_low->SetValue($slider_high->GetValue) if ($event->ShiftDown());
-            $self->set_z_idx_high($slider_high->GetValue);
-        } elsif ($key == ord('D') || $key == WXK_LEFT) {
-            $slider_high->SetValue($slider_high->GetValue - 1);
-            $slider_low->SetValue($slider_high->GetValue) if ($event->ShiftDown());
-            $self->set_z_idx_high($slider_high->GetValue);
-        } elsif ($key == ord('S')) {
-            $checkbox_singlelayer->SetValue(! $checkbox_singlelayer->GetValue());
-            $self->single_layer($checkbox_singlelayer->GetValue());
-            if ($self->single_layer) {
-                $slider_low->SetValue($slider_high->GetValue);
+        if ($event->HasModifiers) {
+            $event->Skip;
+        } else {
+            if ($key == ord('U') || $key == WXK_RIGHT) {
+                $slider_high->SetValue($slider_high->GetValue + 1);
+                $slider_low->SetValue($slider_high->GetValue) if ($event->ShiftDown());
                 $self->set_z_idx_high($slider_high->GetValue);
+            } elsif ($key == ord('D') || $key == WXK_LEFT) {
+                $slider_high->SetValue($slider_high->GetValue - 1);
+                $slider_low->SetValue($slider_high->GetValue) if ($event->ShiftDown());
+                $self->set_z_idx_high($slider_high->GetValue);
+            } elsif ($key == ord('S')) {
+                $checkbox_singlelayer->SetValue(! $checkbox_singlelayer->GetValue());
+                $self->single_layer($checkbox_singlelayer->GetValue());
+                if ($self->single_layer) {
+                    $slider_low->SetValue($slider_high->GetValue);
+                    $self->set_z_idx_high($slider_high->GetValue);
+                }
+            } else {
+                $event->Skip;
             }
         }
     });
diff --git a/lib/Slic3r/GUI/Plater/3DToolpaths.pm b/lib/Slic3r/GUI/Plater/3DToolpaths.pm
index 0575daa84..fb904b0fd 100644
--- a/lib/Slic3r/GUI/Plater/3DToolpaths.pm
+++ b/lib/Slic3r/GUI/Plater/3DToolpaths.pm
@@ -50,14 +50,19 @@ sub new {
     });
     EVT_KEY_DOWN($canvas, sub {
         my ($s, $event) = @_;
-        
-        my $key = $event->GetKeyCode;
-        if ($key == 85 || $key == 315) {
-            $slider->SetValue($slider->GetValue + 1);
-            $self->set_z($self->{layers_z}[$slider->GetValue]);
-        } elsif ($key == 68 || $key == 317) {
-            $slider->SetValue($slider->GetValue - 1);
-            $self->set_z($self->{layers_z}[$slider->GetValue]);
+        if ($event->HasModifiers) {
+            $event->Skip;
+        } else {
+            my $key = $event->GetKeyCode;
+            if ($key == 85 || $key == 315) {
+                $slider->SetValue($slider->GetValue + 1);
+                $self->set_z($self->{layers_z}[$slider->GetValue]);
+            } elsif ($key == 68 || $key == 317) {
+                $slider->SetValue($slider->GetValue - 1);
+                $self->set_z($self->{layers_z}[$slider->GetValue]);
+            } else {
+                $event->Skip;
+            }
         }
     });