Gazebo mimic joints property

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Hi.

I'm trying to "link" two joints with the mimic joint property. I readed that this property isn't suported officialy yet but there is in the code of Gazebo and can be used.

I readed here: http://www.ros.org/doc/api/urdf/html/joint_8h_source.html and found some exemples like this:

<joint name="r_gripper_r_finger_joint" type="revolute">
  <axis xyz="0 0 -1"/>
  <origin rpy="0 0 0" xyz="0.07691 -0.01 0"/>
  <limit effort="1000.0" lower="0.0" upper="0.548" velocity="0.5"/>
  <dynamics damping="0.2"/>
  <mimic joint="r_gripper_l_finger_joint" multiplier="1" offset="0"/>
  <parent link="r_gripper_palm_link"/>
  <child link="r_gripper_r_finger_link"/>
</joint>

But when I try to link my joints it has no efect, and when I apply one effort to a "joint_left_wheel" the "joint_right_wheel" (presumably connected) keeps in the position. My code is the next (I also tried with the next parameters joint_name="joint_left_wheel" multiplier="1" offset="0"), does you see any mistake?

<joint name="joint_right_wheel" type="continuous">
  <origin xyz="0.35 0 0.1" rpy="0 0 0" />
  <axis xyz="0 0 0" />
  <mimic joint="joint_left_wheel" multiplier="1" offset="0"/>
  <parent link="chassis"/>
  <child link="right_wheel"/>
</joint>

Thanks!