make styleresource static
diff --git a/bundles/runtime/org.eclipse.fx.ui.controls/src/org/eclipse/fx/ui/controls/stage/DefaultFramePane.java b/bundles/runtime/org.eclipse.fx.ui.controls/src/org/eclipse/fx/ui/controls/stage/DefaultFramePane.java
index 79de3b9..0953cf7 100644
--- a/bundles/runtime/org.eclipse.fx.ui.controls/src/org/eclipse/fx/ui/controls/stage/DefaultFramePane.java
+++ b/bundles/runtime/org.eclipse.fx.ui.controls/src/org/eclipse/fx/ui/controls/stage/DefaultFramePane.java
@@ -32,7 +32,7 @@
 

 /**

  * A default implementation for the window

- * 

+ *

  * @since 2.0

  */

 public class DefaultFramePane extends ResizeableFramePane {

@@ -67,7 +67,7 @@
 

 	/**

 	 * Create a new pane

-	 * 

+	 *

 	 * @param lightweight

 	 *            <code>true</code> to make it lightweight

 	 */

@@ -78,7 +78,7 @@
 	/**

 	 * Create a default window pane (heavyweight) with a default client area as

 	 * {@link #setContent(Node)}

-	 * 

+	 *

 	 * @param contentContainer

 	 *            a contentContainer area

 	 */

@@ -88,7 +88,7 @@
 

 	/**

 	 * Create a default frame pane

-	 * 

+	 *

 	 * @param contentContainer

 	 *            the content container

 	 * @param lightweight

@@ -111,6 +111,10 @@
 	@Override

 	protected Node createWindowArea() {

 		BorderPane root = new BorderPane();

+		root.setOpacity(1.0);

+		backgroundProperty().addListener( (o,ol,ne) -> {

+			System.err.println(ne);

+		});

 

 		getStyleClass().addAll("default-window", "decorated-root"); //$NON-NLS-1$ //$NON-NLS-2$

 

@@ -243,7 +247,7 @@
 

 	/**

 	 * Update the client area node

-	 * 

+	 *

 	 * @param o

 	 *            the property

 	 * @param oldClientArea

@@ -278,9 +282,11 @@
 		}

 	}

 

+	private static String USER_AGENT_CSS = DefaultFramePane.class.getResource("window.css").toExternalForm(); //$NON-NLS-1$

+

 	@Override

 	public String getUserAgentStylesheet() {

-		return DefaultFramePane.class.getResource("window.css").toExternalForm(); //$NON-NLS-1$

+		return USER_AGENT_CSS;

 	}

 

 }