Showon with nested fields?

Question

I am trying to figure out how to get the showon tag to work with nested fields. Could someone please look at the code below and tell me what I do wrong or if it is at all possible.

<field name="main"
       type="radio"
       class="btn-group btn-group-yesno"
       default="0"
       label="LABEL"
       description="DESC" >
       <option value="0">JNO</option>
       <option value="1">JYES</option>
</field>

<field name="sub"
       type="radio"
       class="btn-group btn-group-yesno"
       default="0"
       showon="main:1"
       label="LABEL"
       description="DESC">
       <option value="0">JNO</option>
       <option value="1">JYES</option>
</field>        

<field name="nested"
       type="text"
       default=""
       showon="main:1,sub:1"
       label="LABEL"
       description="DESC">
</field>        

Answer 1

Man, although I'm not 100% sure, you should use:

<field name="nested"
       type="text"
       default=""
       showon="main:1[AND]sub:1"
       label="LABEL"
       description="DESC">
</field>

The [AND] expects both to be true. This way your nested field should work.