Textblock and textbox with the same source

WPFUI/ViewModels/ShellViewModel.cs

@@ -9,6 +9,16 @@ namespace WPFUI.ViewModels
 {
     public class ShellViewModel : Screen
     {
-        
+        private string _firstName = "Tommy";
+
+        public string FirstName
+        {
+            get { 
+                return _firstName; 
+            }
+            set { 
+                _firstName = value; 
+            }
+        }
     }
 }