New tooltips.

Mage.Client/src/main/java/mage/client/components/MageJDesktop.java

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+package mage.client.components;
+
+import com.sun.java.swing.Painter;
+
+import javax.swing.*;
+import java.awt.*;
+
+/**
+ * Overrides JDesktopPane settings for Nimbus LAF.
+ *
+ * @author nantuko
+ */
+public class MageJDesktop extends JDesktopPane {
+
+    @Override
+    public void updateUI() {
+        if ("Nimbus".equals(UIManager.getLookAndFeel().getName())) {
+            UIDefaults map = new UIDefaults();
+            Painter painter = new Painter() {
+
+                Color color = null;
+
+                @Override
+                public void paint(Graphics2D g, Object c, int w, int h) {
+                    g.setColor(color == null ? UIManager.getDefaults().getColor("desktop") : color);
+                    g.fillRect(0,0,w,h);
+                }
+            };
+            map.put("DesktopPane[Enabled].backgroundPainter", painter);
+            putClientProperty("Nimbus.Overrides", map);
+        }
+        super.updateUI();
+    }
+}