Why does UICompoent.getCurrentComponent sometimes return the parent of the current component?

[Jason Irwin]

According to the API docs, UIComponent.getCurrentComponent(FacesContext) should return the UICompnoent that is currently processing. Unfortunately it is not doing this, or I am not understanding why it returns the component I am seeing. I am using JSF 2.0, Mojarra.

I have a very simple form:

<f:view>
	<h:form>
		<h:panelGrid columns="2">
			<h:outputLabel id="lblFoo" for="txtFoo" value="Foo Value:" />
			<h:inputText id="txtFoo" value="#{testBean.attrValue}" />
		</h:panelGrid>
		<h:commandButton id="btnDoSomething" value="Clicky" action="#{testBean.doSomething}" />
	</h:form>
</f:view>

The backing bean has the relevant getter and setter:

public String getAttrValue()    
{    
	String result = "";    
    	    
	//Get the current component    
	//This sometimes returns the InputText, at others the PanelGrid    
	UIComponent uic = UIComponent.getCurrentComponent(FacesContext.getCurrentInstance());    
    	
	//Some sort of processing will happen here
    
	return result;
    }
    
    public void setAttrValue(String value)
    {
	//Get the current component
	//And this is main problem as it always returns the PanelGrid, not the InputText
	UIComponent uic = UIComponent.getCurrentComponent(FacesContext.getCurrentInstance());
    
	//Some sort of processing will happen here
}

As I have stated in the comments, "UIComponent.getCurrentComponent" does not consistently return the "inputText", it quite often returns the "panelGrid". I totally understand that the "panelGrid" will be restored during the Faces lifecycle, but it is not bound to "[get|set]AttrValue", only the "inputText" is.

Why am I seeing "panelGrid" as the current component in the "[get|set]AttrValue"?