Nested block and getChildHtml() in magento - magento

Question

I have some trouble when i get data with function getChildHtml() .
Here is my layout.xml file
<?xml version="1.0"?>
<layout version="0.1.0">
<hello_index_index>
<reference name="content">
<block type="hello/hello" name="title" template="hello/title.phtml">
<block type="hello/hello" name="title1" template="hello/title1.phtml">
<block type="hello/hello" name="title2" template="hello/title2.phtml"/>
</block>
</block>
</reference>
</hello_index_index>
</layout>
when i try print data in file title2.phtml to the screen with code is
echo $this->getChildHtml('title2');
OR
echo $this->getChildHtml('title1');
In the first way is no data displayed on the screen .
In the second way have data displayed on the screen but only data in file title1.phtml .
So how to display the data in file title2.phtml
Thank everybody .

Answer 1

As your code example is somewhat obscured, it's difficult for me to understand what your blocks actually are and/or do.
Remove the association between "title1" and "title2", then try rendering your block(s) with getChildHtml again.
<?xml version="1.0"?>
<layout version="0.1.0">
<hello_index_index>
<reference name="content">
<block name="title" template="hello/title.phtml" type="hello/hello">
<block name="title1" template="hello/title1.phtml" type="hello/hello" />
<block name="title2" template="hello/title2.phtml" type="hello/hello" />
</block>
</reference>
</hello_index_index>
</layout>

Answer 2

<block type="hello/hello" name="title" template="hello/title.phtml">
<block type="hello/hello" name="title1" template="hello/title1.phtml">
<block type="hello/hello" name="title2" template="hello/title2.phtml"/>
</block>
</block>
in title.phtml write $this->getChildHtml('title1'); and in title1.phtml write
$this->getChildHtml('title2')
because magento blocks can render only "child" blocks when using "getChildHtml()"