tomcat 8 context.xml problems

[Ed Rouse]

Migrating to 8.0 and am having trouble with a custom Resource loader. Below is 
my context.xml file:

<Context>
                <Resources 
className="com.comsquared.idw.catalina.ext.MyCustomStandardRoot" />
                <Loader 
loaderClass="com.comsquared.idw.catalina.ext.MyClassLoader" delegate="true"
                                useSystemClassLoaderAsParent="false" />
                <Resource name="jdbc/ImageDirectorWorkflowDS" 
type="javax.sql.DataSource" factory="com.comsquared.idwm.DataSourceFactory" />
</Context>

I am not concerned about the datasource right now. But when I try to get the 
context

org.apache.catalina.Context ctx = this.getContext();

ctx is null. Do I need to add something to the context.xml file? The docs only 
mention this:

"The standard implementation of Resources is 
org.apache.catalina.webresources.StandardRoot, and is configured by its parent 
Context element."

But no mention about how a custom implementation of Resources gets its Context. 
I would assume from its parent as well. But how do I get the parent context?

Thanks, Ed.