RVIZ, multiple cameras (kinects), same global frame [closed]

edit

I have 2 kinects (v1 1414) running from the same launch file. I can access both in rviz but I have to switch Global Options > Fixed Frame from kinect1_link to kinect2_link.

#Question

How can I make both cameras be viewed in the same Fixed Frame ?

Launch file:

<launch>

    <arg name="camera1_id" default="#1" />
    <arg name="camera2_id" default="#2" />

    <arg name="camera1_name" default="kinect1" />
    <arg name="camera2_name" default="kinect2" />

  <!-- Launching first kinect-->
    <include file="$(find freenect_launch)/launch/freenect.launch">
        <arg name="device_id" value="$(arg camera1_id)" />
        <arg name="camera" value="$(arg camera1_name)" />
        <!--arg name="depth_registration" value="$(arg depth_registration)" /-->
     </include>

 <!-- Launching second kinect-->
    <include file="$(find freenect_launch)/launch/freenect.launch">
        <arg name="device_id" value="$(arg camera2_id)" />
        <arg name="camera" value="$(arg camera2_name)" />
     </include>

  </launch>