Grid in grid's detail with Sapphire theme text color (possible bug?)

<grid fixedLayout="true">
        <columns>
            <column width="40px" />
            <column sort="auto" />
            <column width="100px" label="Price" sort="auto" />
            <column label="Item location" sort="auto" />
        </columns>
        <rows>
            <row>
                <detail open="false">
                  <grid>
                    <columns>
                      	<column>
                          Col1
	                </column>
                    </columns>
                    <rows>
                      <row>Hola</row>
                      <row>Hola</row>
                      <row>Hola</row><row>Hola</row>
                      <row>Hola</row>
                      <row>Hola</row>
                    </rows>
                  </grid>
                </detail>
                <label value="Apple 20-inch Aluminum Cinema Display M9177/A" />
                <label style="color:green;float:right;" value="US $202.50" />
                <label value="Tulsa, OK, United States" />
            </row>
        </rows>
    </grid>