? src/org/netbeans/core/spi/multiview/SourceViewMarker.java
Index: manifest.mf
===================================================================
RCS file: /cvs/core/multiview/manifest.mf,v
retrieving revision 1.12
diff -u -r1.12 manifest.mf
--- manifest.mf	7 Aug 2007 22:42:04 -0000	1.12
+++ manifest.mf	11 Sep 2007 08:08:42 -0000
@@ -1,6 +1,6 @@
 Manifest-Version: 1.0
 OpenIDE-Module: org.netbeans.core.multiview/1
-OpenIDE-Module-Specification-Version: 1.9
+OpenIDE-Module-Specification-Version: 1.10
 OpenIDE-Module-Localizing-Bundle: org/netbeans/core/multiview/resources/Bundle.properties
 OpenIDE-Module-Layer: org/netbeans/core/multiview/resources/mf-layer.xml
 AutoUpdate-Essential-Module: true
Index: api/doc/changes/apichanges.xml
===================================================================
RCS file: /cvs/core/multiview/api/doc/changes/apichanges.xml,v
retrieving revision 1.5
diff -u -r1.5 apichanges.xml
--- api/doc/changes/apichanges.xml	1 Jul 2006 08:51:41 -0000	1.5
+++ api/doc/changes/apichanges.xml	11 Sep 2007 08:08:42 -0000
@@ -85,6 +85,21 @@
   <changes>
     <change>
         <api name="multiview_spi"/>
+        <summary>Added marker interface SourceViewMarker to identify elements with sourcecode.</summary>
+        <version major="1" minor="10"/>
+        <date day="17" month="9" year="2007"/>
+        <author login="mkleint"/>
+        <compatibility addition="yes"/>
+        <description>
+Adding a marker interface for <code>MultiViewDescription</code> instances that allows to identify them
+ as containing source code. The associated <code>MultiViewElement</code>'s visual representation
+ is assumed to implement <code>CloneableEditorSupport.Pane</code> interface.
+        </description>
+        <class package="org.netbeans.core.spi.multiview" name="SourceViewMarker"/>
+        <issue number="68912"/>
+    </change>
+    <change>
+        <api name="multiview_spi"/>
         <summary>Added factory methods to create multiview component</summary>
         <version major="1" minor="1"/>
         <date day="4" month="5" year="2004"/>
Index: src/org/netbeans/core/multiview/MultiViewCloneableTopComponent.java
===================================================================
RCS file: /cvs/core/multiview/src/org/netbeans/core/multiview/MultiViewCloneableTopComponent.java,v
retrieving revision 1.17
diff -u -r1.17 MultiViewCloneableTopComponent.java
--- src/org/netbeans/core/multiview/MultiViewCloneableTopComponent.java	22 Aug 2007 06:03:53 -0000	1.17
+++ src/org/netbeans/core/multiview/MultiViewCloneableTopComponent.java	11 Sep 2007 08:08:42 -0000
@@ -23,6 +23,8 @@
 import java.util.Collection;
 import java.util.Iterator;
 import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 import javax.swing.Action;
 import javax.swing.SwingUtilities;
 import org.netbeans.core.multiview.MultiViewModel.ActionRequestObserverFactory;
@@ -30,6 +32,7 @@
 import org.netbeans.core.spi.multiview.MultiViewDescription;
 import org.netbeans.core.spi.multiview.MultiViewElement;
 import org.netbeans.core.spi.multiview.MultiViewElementCallback;
+import org.netbeans.core.spi.multiview.SourceViewMarker;
 import org.openide.awt.UndoRedo;
 import org.openide.text.CloneableEditorSupport;
 import org.openide.util.HelpCtx;
@@ -218,6 +221,20 @@
                 // fingers crossed and hope for the best... could result in bad results once
                 // we have multiple editors in the multiview component.
                 return el;
+            }
+        }
+        
+        MultiViewDescription[] descs = peer.model.getDescriptions();
+        for (MultiViewDescription desc : descs) {
+            if (desc instanceof SourceViewMarker) {
+                peer.tabs.changeVisibleManually(desc);
+                el = peer.model.getActiveElement();
+                if (el.getVisualRepresentation() instanceof CloneableEditorSupport.Pane) {
+                    return el;
+                } else {
+                    Logger.getLogger(getClass().getName()).info("MultiViewDescription " + desc.getDisplayName() + "(" + desc.getClass() + 
+                            ") claimed to contain sources, but it's MutliViewElement.getVisualRepresentation() didn't return a valid CloeanbleEditorSupport.Pane instance.");
+                }
             }
         }
         // hopeless case, don't try to create new elements. it's users responsibility to