diff -r eddd43c4b4ce openide.explorer/apichanges.xml
--- a/openide.explorer/apichanges.xml	Tue Jun 29 16:30:47 2010 +0200
+++ b/openide.explorer/apichanges.xml	Tue Jun 29 23:49:43 2010 +0200
@@ -50,6 +50,21 @@
 <apidef name="explorer">Explorer API</apidef>
 </apidefs>
 <changes>
+    <change id="OutlineView.setTreeHorizontalScrollBarPolicy">
+        <api name="explorer"/>
+        <summary>OutlineView can provide horizontal scroll bar in the tree column.</summary>
+        <version major="6" minor="30"/>
+        <date day="7" month="7" year="2010"/>
+        <author login="mentlicher"/>
+        <compatibility binary="compatible" source="compatible" deprecation="no" deletion="no" addition="yes"/>
+        <description>
+            In order to be able to provide horizontal scroll bar in the tree column,
+            two methods are added: <code>getTreeHorizontalScrollBarPolicy()</code>
+            and <code>setTreeHorizontalScrollBarPolicy()</code>.
+        </description>
+        <class package="org.openide.explorer.view" name="OutlineView"/>
+        <issue number="188130"/>
+    </change>
     <change id="ListView.setShowParentNode">
         <api name="explorer"/>
         <summary>ListView can now display ".." item</summary>
diff -r eddd43c4b4ce openide.explorer/manifest.mf
--- a/openide.explorer/manifest.mf	Tue Jun 29 16:30:47 2010 +0200
+++ b/openide.explorer/manifest.mf	Tue Jun 29 23:49:43 2010 +0200
@@ -2,5 +2,5 @@
 OpenIDE-Module: org.openide.explorer
 OpenIDE-Module-Localizing-Bundle: org/openide/explorer/Bundle.properties
 AutoUpdate-Essential-Module: true
-OpenIDE-Module-Specification-Version: 6.29
+OpenIDE-Module-Specification-Version: 6.30
 
diff -r eddd43c4b4ce openide.explorer/src/org/openide/explorer/view/OutlineView.java
--- a/openide.explorer/src/org/openide/explorer/view/OutlineView.java	Tue Jun 29 16:30:47 2010 +0200
+++ b/openide.explorer/src/org/openide/explorer/view/OutlineView.java	Tue Jun 29 23:49:43 2010 +0200
@@ -324,7 +324,39 @@
         hScrollBar.getModel().addChangeListener(listener);
     }
 
-    void setTreeHorizontalScrollBarPolicy(int policy) {
+    /**
+     * Returns the horizontal scroll bar policy value for the tree column.
+     * @return the <code>treeHorizontalScrollBarPolicy</code> property
+     * @see #setTreeHorizontalScrollBarPolicy
+     * @since 6.30
+     */
+    public int getTreeHorizontalScrollBarPolicy() {
+        return treeHorizontalScrollBarPolicy;
+    }
+
+    /**
+     * Determines when the horizontal scrollbar appears in the tree column.
+     * The options are:<ul>
+     * <li><code>ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED</code>
+     * <li><code>ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER</code>
+     * <li><code>ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS</code>
+     * </ul>
+     *
+     * @param policy one of the three values listed above
+     * @exception IllegalArgumentException if <code>policy</code>
+     *				is not one of the legal values shown above
+     * @see #getTreeHorizontalScrollBarPolicy
+     * @since 6.30
+     *
+     * @beaninfo
+     *   preferred: true
+     *       bound: true
+     * description: The tree column scrollbar policy
+     *        enum: HORIZONTAL_SCROLLBAR_AS_NEEDED ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED
+     *              HORIZONTAL_SCROLLBAR_NEVER ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER
+     *              HORIZONTAL_SCROLLBAR_ALWAYS ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS
+     */
+    public void setTreeHorizontalScrollBarPolicy(int policy) {
         if (policy == treeHorizontalScrollBarPolicy) {
             return ;
         }