diff --git a/o.n.swing.tabcontrol/apichanges.xml b/o.n.swing.tabcontrol/apichanges.xml
--- a/o.n.swing.tabcontrol/apichanges.xml
+++ b/o.n.swing.tabcontrol/apichanges.xml
@@ -104,6 +104,24 @@
     <!-- ACTUAL CHANGES BEGIN HERE: -->
 
 <changes>
+
+    <change id="topcomponent_level_winsys_customizations">
+      <api name="tabcontrol"/>
+      <summary>Added new abstract class WinsysInfoForTabbedContainer which can
+      adjust some tabbed container properties and behavior.</summary>
+      <version major="1" minor="15"/>
+      <date day="13" month="1" year="2009"/>
+      <author login="saubrecht"/>
+      <compatibility addition="yes" binary="compatible" deprecation="no"/>
+      <description>
+        <p>Added new methods to class WinsysInfoForTabbedContainer to find out the
+        status (enabled/disabled) of some window system features. For example, is the TopComponent
+        allowed to slide-out.
+        </p>
+      </description>
+      <class package="org.netbeans.swing.tabcontrol" name="WinsysInfoForTabbedContainer"/>
+      <issue number="156693"/>
+    </change>
 
     <change id="winsysinfo_for_tabbed_container">
       <api name="tabcontrol"/>
diff --git a/o.n.swing.tabcontrol/manifest.mf b/o.n.swing.tabcontrol/manifest.mf
--- a/o.n.swing.tabcontrol/manifest.mf
+++ b/o.n.swing.tabcontrol/manifest.mf
@@ -1,6 +1,6 @@
 Manifest-Version: 1.0
 OpenIDE-Module-Localizing-Bundle: org/netbeans/swing/tabcontrol/Bundle.properties
 OpenIDE-Module: org.netbeans.swing.tabcontrol
-OpenIDE-Module-Specification-Version: 1.14
+OpenIDE-Module-Specification-Version: 1.15
 AutoUpdate-Essential-Module: true
 
diff --git a/o.n.swing.tabcontrol/src/org/netbeans/swing/tabcontrol/WinsysInfoForTabbedContainer.java b/o.n.swing.tabcontrol/src/org/netbeans/swing/tabcontrol/WinsysInfoForTabbedContainer.java
--- a/o.n.swing.tabcontrol/src/org/netbeans/swing/tabcontrol/WinsysInfoForTabbedContainer.java
+++ b/o.n.swing.tabcontrol/src/org/netbeans/swing/tabcontrol/WinsysInfoForTabbedContainer.java
@@ -42,6 +42,7 @@
 package org.netbeans.swing.tabcontrol;
 
 import java.awt.Component;
+import org.openide.windows.TopComponent;
 
 
 /**
@@ -72,6 +73,45 @@
      * from TopComponent's header.
      */
     public boolean isTopComponentClosingEnabled() {
+        return true;
+    }
+
+    /**
+     * @return True if given TopComponent can be closed, false to remove Close button
+     * from TopComponent's header.
+     */
+    public boolean isTopComponentClosingEnabled( TopComponent tc ) {
+        return true;
+    }
+
+    /**
+     * @return True if given TopComponent can be slided-out, false to remove 'Minimize Window'
+     * action from TopComponent's popup menu.
+     */
+    public boolean isTopComponentSlidingEnabled( TopComponent tc ) {
+        return true;
+    }
+
+    /**
+     * @return True if given TopComponent can be dragged-out and dropped into a
+     * different mode.
+     */
+    public boolean isTopComponentDraggingEnabled( TopComponent tc ) {
+        return true;
+    }
+
+    /**
+     * @return True if given TopComponent can be undocked (floating), false to
+     * remove "Undock Window" action from TopComponent's popup menu.
+     */
+    public boolean isTopComponentUndockingEnabled( TopComponent tc ) {
+        return true;
+    }
+
+    /**
+     * @return True if given TopComponent can be maximized.
+     */
+    public boolean isTopComponentMaximizationEnabled( TopComponent tc ) {
         return true;
     }
     
diff --git a/openide.windows/apichanges.xml b/openide.windows/apichanges.xml
--- a/openide.windows/apichanges.xml
+++ b/openide.windows/apichanges.xml
@@ -47,6 +47,29 @@
 <apidef name="winsys">Window System API</apidef>
 </apidefs>
 <changes>
+
+<change id="per_topcomponent_winsys_customizations">
+    <api name="winsys"/>
+    <summary>Added a group of client properties for customization
+    of window system behavior on per-TopComponent basis.</summary>
+    <version major="6" minor="26"/>
+    <date day="13" month="1" year="2009"/>
+    <author login="saubrecht"/>
+    <compatibility addition="yes" binary="compatible" source="compatible" semantic="compatible" deprecation="no" deletion="no" modification="no"/>
+    <description>
+	<p>There is a set of new boolean client properties which platform
+        developers can use to customize the behavior of individual TopComponents in NetBeans' window system:</p>
+        <ul>
+            <li>Disable window closing</li>
+            <li>Disable window drag and drop</li>
+            <li>Disable window undocking (floating windows)</li>
+            <li>Disable window sliding</li>
+            <li>Disable window maximization</li>
+        </ul>
+        <p>The features above can be turned on/off simply by branding of core.windows module.</p>
+    </description>
+    <issue number="156693"/>
+</change>
 
 <change id="tc.open">
     <api name="winsys"/>
diff --git a/openide.windows/arch.xml b/openide.windows/arch.xml
--- a/openide.windows/arch.xml
+++ b/openide.windows/arch.xml
@@ -540,11 +540,41 @@
 
 <api type="export" group="property" name="netbeans.winsys.tc.keep_preferred_size_when_slided_in" category="stable">
      Name of TopComponent's Boolean client property which forces the window system
-     to respect TopComponent's preferred size when it is slided-in from left/right/bottom 
+     to respect TopComponent's preferred size when it is slided-in from left/right/bottom
      sliding bar when set to Boolean.TRUE. Otherwise the slided-in TopComponent
      will fill the entire width/length of the IDE window (the default behavior).
-     This switch is intended for tools/palette windows like e.g. color chooser, 
+     This switch is intended for tools/palette windows like e.g. color chooser,
      tool picker etc.
+</api>
+
+<api type="export" group="property" name="netbeans.winsys.tc.closing_disabled" category="stable">
+     Name of TopComponent's Boolean client property which removes close button
+     from TopComponent's header and disables its 'Close Window' action when set to Boolean.TRUE.
+</api>
+
+<api type="export" group="property" name="netbeans.winsys.tc.sliding_disabled" category="stable">
+     Name of TopComponent's Boolean client property which removes 'minimized' button
+     from TopComponent's header and disables its 'Minimize Window' action when
+     set to Boolean.TRUE. TopComponents which are already slided-out and have this
+     property set to Boolean.TRUE will have 'pin' button removed from their header
+     and their 'Minimize Window' action will be disabled.
+</api>
+
+<api type="export" group="property" name="netbeans.winsys.tc.undocking_disabled" category="stable">
+     Name of TopComponent's Boolean client property which disables TopComponent's
+     'Undock Window' action when set to Boolean.TRUE. TopComponents which are already
+     floating and have this property set to Boolean.TRUE will have their 'Dock Window' action disabled.
+</api>
+
+<api type="export" group="property" name="netbeans.winsys.tc.dragging_disabled" category="stable">
+     Name of TopComponent's Boolean client property which disables drag and drop
+     when set to Boolean.TRUE.
+</api>
+
+<api type="export" group="property" name="netbeans.winsys.tc.maximization_disabled" category="stable">
+     Name of TopComponent's Boolean client property which disables TopComponent 
+     maximization by double-clicking its header when set to Boolean.TRUE. TopComponent's
+     'Maximize Window' action will be also disabled.
 </api>
 
 
diff --git a/openide.windows/manifest.mf b/openide.windows/manifest.mf
--- a/openide.windows/manifest.mf
+++ b/openide.windows/manifest.mf
@@ -1,6 +1,6 @@
 Manifest-Version: 1.0
 OpenIDE-Module: org.openide.windows
-OpenIDE-Module-Specification-Version: 6.25
+OpenIDE-Module-Specification-Version: 6.26
 OpenIDE-Module-Localizing-Bundle: org/openide/windows/Bundle.properties
 AutoUpdate-Essential-Module: true