diff --git a/app/block_view.rb b/app/block_view.rb
index 910ac42..af3b5b3 100644
--- a/app/block_view.rb
+++ b/app/block_view.rb
@@ -6,21 +6,26 @@ class BlockView
   include React::Component
   required_param :interpreter
 
+  define_state :block
+
   before_mount do
-    interpreter.register_event(event: :block_changed, listener: self, callback: :block_changed)
+    interpreter.register_event(:block_changed,  self)
+    block! interpreter.block
   end
 
-  def block_changed block
-    block! block
+  def block_changed old , bl
+    block! bl
   end
 
   def render
+    return unless block
     div.row  do
       div.col_md_5 do
-        SourceView  :source => interpreter.block.codes.first.source
+        SourceView  :source => block.codes.first.source
       end
       div.col_md_5 do
-        interpreter.block.codes.each do |code|
+        h6 { "Block: #{block.name}"}
+        block.codes.each do |code|
           code.to_s.br
         end
       end
diff --git a/app/source_view.rb b/app/source_view.rb
index 3ba87d6..d5fabbb 100644
--- a/app/source_view.rb
+++ b/app/source_view.rb
@@ -6,8 +6,8 @@ class SourceView
 
   def render
     div.row  do
-      "Virtual Machine Instruction".span
-      source
+      "Virtual Machine Instruction".br
+      source.class.name
     end
   end
 
diff --git a/lib/interpreter.rb b/lib/interpreter.rb
index 3dcbf6f..da6f92a 100644
--- a/lib/interpreter.rb
+++ b/lib/interpreter.rb
@@ -36,7 +36,8 @@ class Interpreter
   end
 
   def execute_Branch
-    target = @instruction.to
+    target = @instruction.block
     set_block target
+    false
   end
 end