diff --git a/gsf.testrunner/src/org/netbeans/modules/gsf/testrunner/api/ResultDisplayHandler.java b/gsf.testrunner/src/org/netbeans/modules/gsf/testrunner/api/ResultDisplayHandler.java
--- a/gsf.testrunner/src/org/netbeans/modules/gsf/testrunner/api/ResultDisplayHandler.java
+++ b/gsf.testrunner/src/org/netbeans/modules/gsf/testrunner/api/ResultDisplayHandler.java
@@ -307,6 +307,10 @@
 
         displayInDispatchThread(prepareMethod("displayMsgSessionFinished", String.class), msg);        //NOI18N
 
+        // #186277: declaration of the ResultWindow as a top component with the 
+        // special results for activation of it instead of usual Output window.
+        // See also org.apache.tools.ant.module.run.TargetExecutor.run().
+        System.setProperty("SPECIAL_RESULTS_TOPCOMPONENT_ID", ResultWindow.ID);
     }
     /** */
     private Map<String, Method> methodsMap = new HashMap<String, Method>();
diff --git a/gsf.testrunner/src/org/netbeans/modules/gsf/testrunner/api/ResultWindow.java b/gsf.testrunner/src/org/netbeans/modules/gsf/testrunner/api/ResultWindow.java
--- a/gsf.testrunner/src/org/netbeans/modules/gsf/testrunner/api/ResultWindow.java
+++ b/gsf.testrunner/src/org/netbeans/modules/gsf/testrunner/api/ResultWindow.java
@@ -73,7 +73,7 @@
 final class ResultWindow extends TopComponent {
 
     /** unique ID of <code>TopComponent</code> (singleton) */
-    private static final String ID = "gsf-testrunner-results";              //NOI18N
+    static final String ID = "gsf-testrunner-results";              //NOI18N
     /**
      * instance/singleton of this class
      *
diff --git a/o.apache.tools.ant.module/src/org/apache/tools/ant/module/run/TargetExecutor.java b/o.apache.tools.ant.module/src/org/apache/tools/ant/module/run/TargetExecutor.java
--- a/o.apache.tools.ant.module/src/org/apache/tools/ant/module/run/TargetExecutor.java
+++ b/o.apache.tools.ant.module/src/org/apache/tools/ant/module/run/TargetExecutor.java
@@ -41,6 +41,7 @@
 
 package org.apache.tools.ant.module.run;
 
+import java.awt.EventQueue;
 import java.awt.event.ActionEvent;
 import java.io.File;
 import java.io.IOException;
@@ -90,6 +91,8 @@
 import org.openide.windows.IOSelect;
 import org.openide.windows.InputOutput;
 import org.openide.windows.OutputWriter;
+import org.openide.windows.TopComponent;
+import org.openide.windows.WindowManager;
 import org.w3c.dom.Element;
 
 /** Executes an Ant Target asynchronously in the IDE.
@@ -482,6 +485,40 @@
                 if (!displayed.getAndSet(true)) {
                     io.select();
                 }
+
+                // #186277
+                EventQueue.invokeLater(new Runnable() {
+
+                        /**
+                         * Activates a top component with the special results if
+                         * the system property "SPECIAL_RESULTS_TOPCOMPONENT_ID"
+                         * defines identifier of that component, otherwise does
+                         * nothing, and then "clears" the property for future
+                         * use.
+                         */
+                        @Override
+                        public void run() {
+                            String  SPECIAL_RESULTS_TOPCOMPONENT_ID_PROP = 
+                                    "SPECIAL_RESULTS_TOPCOMPONENT_ID";
+                            String UNKNOWN_TOPCOMPONENT_ID =
+                                    "***Unknown***";
+                            String id = System.getProperty(
+                                    SPECIAL_RESULTS_TOPCOMPONENT_ID_PROP,
+                                    UNKNOWN_TOPCOMPONENT_ID);
+                            if(UNKNOWN_TOPCOMPONENT_ID.equals(id)) {
+                                return; // do nothing
+                            }
+                            TopComponent specialResults =
+                                WindowManager.getDefault().findTopComponent(id);
+                            if(specialResults != null) {
+                                specialResults.requestActive();
+                            }
+                            // "Clear" the property for future use
+                            System.setProperty(
+                                    SPECIAL_RESULTS_TOPCOMPONENT_ID_PROP,
+                                    UNKNOWN_TOPCOMPONENT_ID);
+                        }
+                    });
             }
         };