The definition of plugin_description.xml is given as follows:
<library path="lib/librviz_telop_commander"> <class name="rviz_telop_commander/Teleop" type="rviz_telop_commander::TeleopPanel" base_class_type="rviz::Panel"> <description> A panel widget allowing simple diff-drive style robot base control. </description> </class> </library>