diff --git a/assets/style/uiskin.json b/assets/style/uiskin.json
index 72f00a02..8df755cd 100644
--- a/assets/style/uiskin.json
+++ b/assets/style/uiskin.json
@@ -215,18 +215,6 @@
       knobBefore: progressbar-filled-vertical
     }
   },
-  com.badlogic.gdx.scenes.scene2d.ui.Slider$SliderStyle: {
-    default-horizontal: {
-      background: slider,
-      knob: slider-knob,
-      disabledKnob: slider-knob-disabled
-    },
-    default-vertical: {
-      background: slider-vertical,
-      knob: slider-knob,
-      disabledKnob: slider-knob-disabled
-    }
-  },
   com.badlogic.gdx.scenes.scene2d.ui.Label$LabelStyle: {
     default: {
       font: default-font,
diff --git a/hyperlap2d-common-api b/hyperlap2d-common-api
index 98f3d35b..8d92d919 160000
--- a/hyperlap2d-common-api
+++ b/hyperlap2d-common-api
@@ -1 +1 @@
-Subproject commit 98f3d35b17b66d9959a3ebf88c0986de50a1a9a2
+Subproject commit 8d92d919a4c3f99b3e1d2bce7955fc3c8e1c2022
diff --git a/src/main/java/games/rednblack/editor/controller/commands/ItemChildrenTransformCommand.java b/src/main/java/games/rednblack/editor/controller/commands/ItemChildrenTransformCommand.java
index 5e5f369a..dbe89804 100644
--- a/src/main/java/games/rednblack/editor/controller/commands/ItemChildrenTransformCommand.java
+++ b/src/main/java/games/rednblack/editor/controller/commands/ItemChildrenTransformCommand.java
@@ -113,7 +113,7 @@ public class ItemChildrenTransformCommand extends EntityModifyRevertibleCommand
         }
     }
 
-    private class PositionSize {
+    private static class PositionSize {
         Vector2 position;
         Vector2 size;
 
diff --git a/src/main/java/games/rednblack/editor/view/stage/input/EntityClickListener.java b/src/main/java/games/rednblack/editor/view/stage/input/EntityClickListener.java
index e0d42c9f..ec2ad35e 100644
--- a/src/main/java/games/rednblack/editor/view/stage/input/EntityClickListener.java
+++ b/src/main/java/games/rednblack/editor/view/stage/input/EntityClickListener.java
@@ -22,7 +22,7 @@ public class EntityClickListener implements InputListener {
 	private int button;
 	private boolean pressed, over, cancelled;
 	private long visualPressedTime;
-	private long tapCountInterval = (long)(0.4f * 1000000000l);
+	private long tapCountInterval = (long)(0.4f * 1000000000L);
 	private int tapCount;
 	private long lastTapTime;
 
@@ -153,7 +153,7 @@ public class EntityClickListener implements InputListener {
 
 	/** @param tapCountInterval time in seconds that must pass for two touch down/up sequences to be detected as consecutive taps. */
 	public void setTapCountInterval (float tapCountInterval) {
-		this.tapCountInterval = (long)(tapCountInterval * 1000000000l);
+		this.tapCountInterval = (long)(tapCountInterval * 1000000000L);
 	}
 
 	/** Returns the number of taps within the tap count interval for the most recent click event. */
diff --git a/src/main/java/games/rednblack/editor/view/ui/box/UIAlignBox.java b/src/main/java/games/rednblack/editor/view/ui/box/UIAlignBox.java
index c33bf3d9..ec1e3116 100644
--- a/src/main/java/games/rednblack/editor/view/ui/box/UIAlignBox.java
+++ b/src/main/java/games/rednblack/editor/view/ui/box/UIAlignBox.java
@@ -96,7 +96,7 @@ public class UIAlignBox extends UICollapsibleBox {
         return visImageButton;
     }
 
-    private class AlignmentButtonClickListener extends ClickListener {
+    private static class AlignmentButtonClickListener extends ClickListener {
 
         private final int alignment;
 
diff --git a/src/main/java/games/rednblack/editor/view/ui/box/UIToolBox.java b/src/main/java/games/rednblack/editor/view/ui/box/UIToolBox.java
index d6747563..9db36023 100644
--- a/src/main/java/games/rednblack/editor/view/ui/box/UIToolBox.java
+++ b/src/main/java/games/rednblack/editor/view/ui/box/UIToolBox.java
@@ -72,7 +72,7 @@ public class UIToolBox extends VisTable {
         return visImageButton;
     }
 
-    private class ToolboxButtonClickListener extends ClickListener {
+    private static class ToolboxButtonClickListener extends ClickListener {
 
         private final String toolId;
 
diff --git a/src/main/java/games/rednblack/editor/view/ui/dialog/SettingsDialog.java b/src/main/java/games/rednblack/editor/view/ui/dialog/SettingsDialog.java
index 1ec83c7b..e228a822 100644
--- a/src/main/java/games/rednblack/editor/view/ui/dialog/SettingsDialog.java
+++ b/src/main/java/games/rednblack/editor/view/ui/dialog/SettingsDialog.java
@@ -103,7 +103,7 @@ public class SettingsDialog extends H2DDialog {
     }
 
     private void applyAllSettings() {
-        for (SettingsNode node : settingsTree.getNodes()) {
+        for (SettingsNode node : settingsTree.getRootNodes()) {
             if (node.getValue().validateSettings()) {
                 node.getValue().translateViewToSettings();
             }
@@ -120,8 +120,8 @@ public class SettingsDialog extends H2DDialog {
     @Override
     public VisDialog show(Stage stage) {
         super.show(stage);
-        if (settingsTree.getSelection().size() == 0 && settingsTree.getNodes().size > 0) {
-            settingsTree.getSelection().add(settingsTree.getNodes().first());
+        if (settingsTree.getSelection().size() == 0 && settingsTree.getRootNodes().size > 0) {
+            settingsTree.getSelection().add(settingsTree.getRootNodes().first());
         }
 
         if (settingsTree.getSelection().size() > 0) {
@@ -142,12 +142,12 @@ public class SettingsDialog extends H2DDialog {
 
     public SettingsNode addSettingsNode(SettingsNodeValue<?> nodeValue) {
         SettingsNode node = new SettingsNode(nodeValue.getName());
-        int existingIndex = settingsTree.getNodes().indexOf(node, false);
+        int existingIndex = settingsTree.getRootNodes().indexOf(node, false);
         if (existingIndex == -1) {
             node.setValue(nodeValue);
             settingsTree.add(node);
         } else {
-            settingsTree.getNodes().get(existingIndex).setValue(nodeValue);
+            settingsTree.getRootNodes().get(existingIndex).setValue(nodeValue);
         }
         return node;
     }