Add 3D MPR entrance.

src/Combinear.css

@@ -251,6 +251,15 @@ QSlider::handle:horizontal:disabled
 }
 
 VolumeRenderingWindow#volumeWin{
-	border:1px solid #cdcdcd;
+	border:1px solid #5a5a5a;
 	border-top:1px solid #333333;
+}
+
+MPRResliceWindow#MPRWin{
+	border:1px solid #5a5a5a;
+	border-top:1px solid #333333;
+}
+
+QSplitter::handle {
+	background: #5a5a5a;
 }