Display buttons depends on Role

Hi,
May I Know how to displaying the buttons depends on user roles. can you give example with code it will helpful to me

Use EL expressions in <tt>disabled</tt> or <tt>rendered</tt> properties of the corresponding command components. For example, if you want to disable a button if the user is not a member of an ADF Application Role called <tt>Configurator</tt> then you may use code similar to the following:
<af:commandButton ... disabled="#{!securityContext.userInRole['Configurator']}">or if you do not want to render the button if the user is not a member of the role:
<af:commandButton ... rendered="#{securityContext.userInRole['Configurator']}">Note, that the specified role must be an ADF Application Role (defined by you using the ADF Security wizard) but not a WebLogic entrerprise group.

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