diff --git a/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/javafx/control/treetableview/.ratings b/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/javafx/control/treetableview/.ratings
index 3ef238d8425fcf37bc9d91f32eab1332757e8bc1..1008aedfb929e3676dd8664538032565f3e98ced 100644
--- a/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/javafx/control/treetableview/.ratings
+++ b/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/javafx/control/treetableview/.ratings
@@ -1,2 +1,2 @@
 DynamicTreeTableNameProvider.java 3ca45f24b94e97b02313e80b16ba8b370f541541 GREEN
-ModelElementTreeViewer.java b541376d1b21d38dec80ae6dd5357fe289dcb643 GREEN
+ModelElementTreeViewer.java c27c57ae21b32de790c6fb5a86695dd5952fcf32 GREEN
diff --git a/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/javafx/control/treetableview/ModelElementTreeViewer.java b/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/javafx/control/treetableview/ModelElementTreeViewer.java
index b541376d1b21d38dec80ae6dd5357fe289dcb643..c27c57ae21b32de790c6fb5a86695dd5952fcf32 100644
--- a/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/javafx/control/treetableview/ModelElementTreeViewer.java
+++ b/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/javafx/control/treetableview/ModelElementTreeViewer.java
@@ -135,6 +135,12 @@ public class ModelElementTreeViewer<T extends INamedElement> {
 		dynTreeViewer.expandItem(item);
 	}
 
+	/** Collapses the given item. */
+	public void collapseItem(T value) {
+		DynamicTreeItemBase<T> item = findItem(value);
+		dynTreeViewer.collapseItem(item);
+	}
+
 	/** Returns the {@link DynamicTreeItemBase} of the given {@code value} if it exists. */
 	public DynamicTreeItemBase<T> findItem(T value) {
 		return dynTreeViewer.findItem(value);
diff --git a/org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/.ratings b/org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/.ratings
index d6ef780a2f276fa0732f78cbbd4cb39ace2b8a33..d0ee06b022f1d48236e455fcb9962ec7239d8057 100644
--- a/org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/.ratings
+++ b/org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/.ratings
@@ -8,7 +8,7 @@ DynamicTreeItemBase.java d883066ecc181120302ca32f328538de7a45b093 GREEN
 DynamicTreeTableUIProviderBase.java a4cd60795d114984f7fd255f273fc39937889f22 GREEN
 DynamicTreeTableViewer.java ead6f6671e9cb6b14632940bf440cba7e81fcd98 GREEN
 DynamicTreeUIProviderBase.java 82d3c051213f0147f4c67ad247a08696cee73110 GREEN
-DynamicTreeViewer.java e58d2cf7239e45f1b790ce9770a8a8649b1b5fb9 GREEN
+DynamicTreeViewer.java 545f1ca10b7b3cad171b294a4b447875da45c9ed GREEN
 DynamicTreeViewerBase.java a2013538b62d86f6a09efdf2cd78babac2072484 GREEN
 EmptyChildrenContentProvider.java 51b4468f9df8423abeea5ac6aa2f6cf99c2eb512 GREEN
 IDoubleClickHandler.java 447f7769dead9a106b3ea3139ef0da51eb0b9a89 GREEN
diff --git a/org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/DynamicTreeViewer.java b/org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/DynamicTreeViewer.java
index e58d2cf7239e45f1b790ce9770a8a8649b1b5fb9..545f1ca10b7b3cad171b294a4b447875da45c9ed 100644
--- a/org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/DynamicTreeViewer.java
+++ b/org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/DynamicTreeViewer.java
@@ -173,6 +173,7 @@ public final class DynamicTreeViewer<T> extends DynamicTreeViewerBase<T> {
 					} else {
 						this.setText(null);
 						this.setGraphic(null);
+						this.setStyle(null);
 					}
 					this.setContextMenu(menu);
 				}
@@ -225,6 +226,16 @@ public final class DynamicTreeViewer<T> extends DynamicTreeViewerBase<T> {
 		uiProvider.dropClipboardContent(item, evt.getDragboard());
 	}
 
+	/** Collapses the given item. */
+	public void collapseItem(TreeItem<T> item) {
+		item.setExpanded(false);
+	}
+
+	/** Collapses all items. */
+	public void collapseAllItems() {
+		collapseItem(rootItem);
+	}
+
 	/** Expands the tree to the given item. */
 	public void expandItem(TreeItem<T> item) {
 		while(item.getParent() != null) {