Joomla ajax Extender
Some values are used by com_extent, using this values may give unexpected results.
This layout names are reserved to add the joomla menu by com_extend:
md, mi, pl, ti, tp & extend
using layout with this names can make troubles(most of case your layout is ignored and set to default).
If your extension is NOT a module, you always have to set the extend in the URL or in the POST values.
com_extend considers module as the default extensoin type and setting only the view values call the module controller.
module minimal valid
index.php&option=extend&extend=mymodule
or
index.php&option=extend&view=mymodule
or
index.php&option=extend&module_id=999
plugin minimal valid
index.php&option=extend&extend=pluginFolder.myplugin
template minimal valid
index.php&option=extend&extend=tp.mytemplate