How can I clear the statusbar text in ExtJS?

I have created a status bar in my proj开发者_StackOverflow中文版ect using ExtJS. I want to change the text after clicking another tab. I'd also like to update it based on a time interval. How can I do this using ExtJS?

If you're using the StatusBar ux you probably want something like:

myStatusBar.setStatus({
    text: 'Whatever',
    clear: true
});