Eclipse not picking up when android layout xml has been changed

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http://stackoverflow.com – Complete android/eclipse newbie question... I am writing an app and making a lot of changes in the app's layout xml. My problem is that when I make these changes, Eclipse doesn't recognise that the project is out of date, so when I click Run or Run > Run As > Android Application nothing happens. I have to go Run > Run Configurations... > Run in order to run my app. In contrast, when I edit any of the java code clicking Run will launch my app immediately. Hardly a disaster, but it gets annoying. Can anyone help? I'm using the Android Developer Tools build of Eclipse, Build: v21.0.1-54303 (HowTos)