<?xml version="1.0"?>
<library>

<tab>
  <parent>defaultexit</parent>
  <caption>some caption</caption>
  <mustnotinherit>_ObjectEditor; defaultplayer; editor_room</mustnotinherit>
   <control>
    <controltype>some_control_type</controltype>
    <caption>some caption</caption>
    <attribute>some_attribute</attribute>
  </control>
</tab>

<tab>
  <parent>editor_room</parent>
  <caption>some caption</caption>
  <mustnotinherit>_ObjectEditor; defaultplayer</mustnotinherit>
  <control>
    <controltype>some_control_type</controltype>
    <caption>some caption</caption>
    <attribute>some_attribute</attribute>
  </control>
</tab>

</library>

The controls for the types I added to the library work just fine but these never do anything.
If I create a type for my exit and controls for that type and have the exit inherit the type it still doesn't add my controls.
Is there a reason why this is happening? Is there a way to add controls to exits and rooms?