Tapestry does not allow you to retrieve the parent of a component. If you have a component C nested in a component P, there is no method to retrieve the parent P from C. What is needed is a getParent() method.
There is no logical reason for not including a getParent method as methods exist to retrieve the children of a component. The getParent method is extremely useful if you wish to change the rendering behavior of a component based on whether it is nested inside a particular component. The JSP taglib API supports this with the TagSupport.findAncestorWithClass(Tag, Class) method. Without the getParent method, it is difficult to convert some JSP tags to Tapestry components.
Fortunately, this improvement is not difficult to implement. I have successfully implemented this by adding a private variable _parent of type IComponent to AbstractComponent and adding getParent/setParent methods to get/set the variable: the getter should look like this:
return _parent != null ? _parent : getContainer();
Finally, add the following line to BaseComponentTemplateLoader.process(OpenToken) method (line 268 under version 3.0.1)
(Note that Tapestry does allow you to retrieve the IComponent a particular component is embedded in via the IComponent.getContainer() call. This call will retrieve the component whose template C was defined in. This method does not address the issue.)