improve growl

According to @ghost1372  suggestion, growl has been improved.

DockBoxResearch/Controls/DocDockBoxItem.cs

@@ -0,0 +1,7 @@
+namespace DockBoxResearch.Controls
+{
+    public class DocDockBoxItem : DockBoxItemBase
+    {
+        
+    }
+}

DockBoxResearch/Controls/DocDockBoxItemPanel.cs

@@ -0,0 +1,9 @@
+using System.Windows.Controls;
+
+namespace DockBoxResearch.Controls
+{
+    public class DocDockBoxItemPanel : Panel
+    {
+        
+    }
+}

DockBoxResearch/Controls/DockBox.cs

@@ -0,0 +1,9 @@
+using System.Windows.Controls;
+
+namespace DockBoxResearch.Controls
+{
+    public class DockBox : Control
+    {
+        
+    }
+}

DockBoxResearch/Controls/DockBoxItem.cs

@@ -0,0 +1,7 @@
+namespace DockBoxResearch.Controls
+{
+    public class DockBoxItem : DockBoxItemBase
+    {
+        
+    }
+}

DockBoxResearch/Controls/DockBoxItemBase.cs

@@ -0,0 +1,9 @@
+using System.Windows.Controls;
+
+namespace DockBoxResearch.Controls
+{
+    public class DockBoxItemBase : Control
+    {
+        
+    }
+}

DockBoxResearch/Controls/DockBoxItemPanel.cs

@@ -0,0 +1,9 @@
+using System.Windows.Controls;
+
+namespace DockBoxResearch.Controls
+{
+    public class DockBoxItemPanel : Panel
+    {
+        
+    }
+}