Access the UI components in the managed bean

I am newbie in Jdeveloper and just read the book of "Quick start guide to oracle developer"
I am confused of the steps of accessing the UI component of the page
e.g.
public void salesman_valueChanged(ValueChangeEvent valueChangeEvent) {
// Add event code here...
getCommission().setDisabled(true);
if (valueChangeEvent.getNewValue().equals("SA_REP")) {
getCommission().setDisabled(false);
getCommission is supposed to return the UI Component instance of text box commission.
How can I implement this?
Thanks.

getCommission is supposed to return the UI Component instance of text box commission.Bind your UIComponent to your managedBean (you would need to register this in teh taskflow or adfc-config.xml) . This can be done using the Binding attribute in the Advanced tax for the inputText component.
"binding=<MemoryScope_onlyIfOtherThanRequestScope.BeanName>.commission" .. this will generate a getCommission() & setCommission() method which can be used.
Also please modify the code below to have a PPR on the component else it will not refresh on the UI-
+public void salesman_valueChanged(ValueChangeEvent valueChangeEvent) {+
+// Add event code here...+
getCommission().setDisabled(true);
+if (valueChangeEvent.getNewValue().equals("SA_REP")) {+
getCommission().setDisabled(false);
+}+
AdfFacesContext.getCurrentInstance().addPartialTarget(getCommission());
+}+

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