I would like to share wit you "Sketchup to CNC" tutorial by using One Click Cabinet extension

Hello everyone!
I created a Layout document by Ruby from SU, and added SU model to it. Then, I added dimension by using the following command:

dim = Layout;;LinearDimension.new(start_2d, end_2d, start_offset_length)
doc.add_entity(dim, layer, page)
dim.connect(start_point, end_point)

However, the background color and the border stroke of the DIMENSION_TEXT are always "red", as you can see in the attached file. It happened after I connect the ConnectionPoints (by using "dim.connect(start_point, end_point)" above.

How can I set the color of the stoke and background to be "white" or none?
Thank you very much for your help.

test1.layout

I am new to Sketchup extension development. Attached file is part of a dynamic component after getting it exploded. Then I applied the following code:

def self.definition(instance)
    if instance.is_a?(Sketchup;;ComponentInstance)
    # ComponentInstance
    return instance.definition
    elsif instance.is_a?(Sketchup;;Group)   
      if instance.entities.parent.instances.include?(instance)
          return instance.entities.parent
      else
          Sketchup.active_model.definitions.each { |definition|
          return definition if definition.instances.include?(instance)
          }
      end
    elsif instance.is_a?(Sketchup;;Image)
    Sketchup.active_model.definitions.each { |definition|
        return definition if definition.image? && definition.instances.include?(instance)
    }
    end
    return nil # Error. We should never exit here.
end

mod = Sketchup.active_model # Open model
ent = mod.entities # All entities in model
sel = mod.selection # Current selection
puts ent[0]
faces =  definition(ent[0]).entities.grep(Sketchup;;Face)
puts faces
faces[0].material = "Purple"
faces[0].vertices.each {|v| puts v.position}
puts '---'
f0_v = faces[0].vertices
for i in 0..f0_v.size - 2
  puts f0_v[i].position.distance(f0_v[i+1].position)
end
puts f0_v[3].position.distance(f0_v[0].position)

The result is not as I am expected:

#<Sketchup;;Group;0x0000024da5ea60b0>
#<Sketchup;;Face;0x0000024da5ea5f20>
#<Sketchup;;Face;0x0000024da5ea5e30>
#<Sketchup;;Face;0x0000024da5ea5d18>
#<Sketchup;;Face;0x0000024da5ea5cc8>
#<Sketchup;;Face;0x0000024da5ea5c78>
#<Sketchup;;Face;0x0000024da5ea5c50>
(0 mm, 0 mm, 300 mm)
(0 mm, 0 mm, 0 mm)
(300 mm, 0 mm, 0 mm)
(300 mm, 0 mm, 300 mm)
---
300 mm
300 mm
300 mm
300 mm

Any one can help me?
I am sorry for my bad English.

test.skp