diff -r e9e53f954f1c o.n.swing.outline/apichanges.xml
--- a/o.n.swing.outline/apichanges.xml	Thu Jan 17 14:54:45 2013 +0100
+++ b/o.n.swing.outline/apichanges.xml	Thu Jan 24 16:56:34 2013 +0100
@@ -108,6 +108,21 @@
 
 <changes>
 
+    <change id="checkAtProtected">
+      <api name="etable_outline"/>
+      <summary>A protected checkAt() method added to Outline</summary>
+      <version major="1" minor="25"/>
+      <date day="1" month="2" year="2013"/>
+      <author login="mentlicher"/>
+      <compatibility addition="yes" binary="compatible" deprecation="no"/>
+      <description>
+        <p>Outline has a checkAt() method to perform a selection/deselection of
+           a check box on the given row and column.
+        </p>
+      </description>
+      <class package="org.netbeans.swing.outline" name="Outline"/>
+      <issue number="223021"/>
+    </change>
     <change id="fireQuickFilterChange">
       <api name="etable_outline"/>
       <summary>Ability to listen on changes of Quick Filter</summary>
diff -r e9e53f954f1c o.n.swing.outline/manifest.mf
--- a/o.n.swing.outline/manifest.mf	Thu Jan 17 14:54:45 2013 +0100
+++ b/o.n.swing.outline/manifest.mf	Thu Jan 24 16:56:34 2013 +0100
@@ -1,5 +1,5 @@
 Manifest-Version: 1.0
 OpenIDE-Module: org.netbeans.swing.outline
 OpenIDE-Module-Localizing-Bundle: org/netbeans/swing/outline/Bundle.properties
-OpenIDE-Module-Specification-Version: 1.24
+OpenIDE-Module-Specification-Version: 1.25
 
diff -r e9e53f954f1c o.n.swing.outline/src/org/netbeans/swing/outline/Outline.java
--- a/o.n.swing.outline/src/org/netbeans/swing/outline/Outline.java	Thu Jan 17 14:54:45 2013 +0100
+++ b/o.n.swing.outline/src/org/netbeans/swing/outline/Outline.java	Thu Jan 24 16:56:34 2013 +0100
@@ -839,7 +839,19 @@
         return false;
     }
 
-    private boolean checkAt(int row, int column, MouseEvent me) {
+    /**
+     * Perform a selection/deselection of a check box on the given row and column,
+     * if a check box exists on the given position.
+     * @param row The row of the check box
+     * @param column The column of the check box
+     * @param me The mouse event that performs the check, or <code>null</code>.
+     * @return <code>true</code> if a {@link CheckRenderDataProvider} is found
+     *         on the given row and column, is checkable and enabled and the
+     *         mouse event is either <code>null</code> or upon the check-box
+     *         location. Returns <code>false</code> otherwise.
+     * @since 1.25
+     */
+    protected final boolean checkAt(int row, int column, MouseEvent me) {
         RenderDataProvider render = getRenderDataProvider();
         TableCellRenderer tcr = getDefaultRenderer(Object.class);
         if (render instanceof CheckRenderDataProvider && tcr instanceof DefaultOutlineCellRenderer) {
@@ -863,8 +875,7 @@
                     int chEnd = chStart + chWidth;
                     //TODO: Translate x/y to position of column if non-0
 
-                    chBoxPosition = (me.getX() > ins.left && me.getX() >= chStart && me.getX() <= chEnd) &&
-                                    me.getClickCount() == 1;
+                    chBoxPosition = (me.getX() > ins.left && me.getX() >= chStart && me.getX() <= chEnd);
                 }
                 if (chBoxPosition) {
                     Boolean selected = crender.isSelected(value);
diff -r e9e53f954f1c openide.explorer/nbproject/project.xml
--- a/openide.explorer/nbproject/project.xml	Thu Jan 17 14:54:45 2013 +0100
+++ b/openide.explorer/nbproject/project.xml	Thu Jan 24 16:56:34 2013 +0100
@@ -54,7 +54,7 @@
                     <build-prerequisite/>
                     <compile-dependency/>
                     <run-dependency>
-                        <specification-version>1.12</specification-version>
+                        <specification-version>1.25</specification-version>
                     </run-dependency>
                 </dependency>
                 <dependency>
diff -r e9e53f954f1c openide.explorer/src/org/openide/explorer/view/OutlineView.java
--- a/openide.explorer/src/org/openide/explorer/view/OutlineView.java	Thu Jan 17 14:54:45 2013 +0100
+++ b/openide.explorer/src/org/openide/explorer/view/OutlineView.java	Thu Jan 24 16:56:34 2013 +0100
@@ -1921,6 +1921,9 @@
             boolean actionPerformed = false;
             boolean isTreeColumn = convertColumnIndexToModel(column) == 0;
             if (isTreeColumn && row != -1 && e instanceof MouseEvent && SwingUtilities.isLeftMouseButton ((MouseEvent) e)) {
+                if (checkAt(row, column, (MouseEvent) e)) {
+                    return false;
+                }
                 int clickCount = ((MouseEvent) e).getClickCount();
                 if (clickCount > 1) {
                     // Default action.