how to disable backspace button in gwt?

Hi! 

My application does not need have any history 

support. 

The problem is that when I type something wrong in textbox,its shows warning in dialogbox and accidentally lose focus and 

then press Backspace key to delete a character from textbox,browser performs application to exit and the whole application is unloaded losing all the 

data. 

How can I disable this?Please give me suggestion.

Thanks! 

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