:static rows are now subclasses of StringRow

this means they also have access to :placeholder and :value

lib/formotion/row_type/static_row.rb

@@ -1,6 +1,9 @@
 module Formotion
   module RowType
-    class StaticRow < Base
+    class StaticRow < StringRow
+      def after_build(cell)
+        self.row.text_field.enabled = false
+      end
     end
   end
 end