How to make image visible in Blackberry when button is pressed?

I want to show image when button is pressed on main screen i开发者_如何学Cn blackberry, How can I do this?

Simply I have a button, when I do press it, the data is loading from xml, and I want to show that data is loading, how can I do this, I have image(having text on it). Help!

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You can add that image in a vertical field manageer and add the vertical field manager to the screen on the button click. that's it..