field selection problem?

i am implement a application for blackberry mobile phone. In this application in using datefield for input开发者_如何转开发 date. whenever change focus, datefield background will be white... what i do.

I thin what you want is, every time the datefield is onfocused, the background will be painted white, right ? I think in that case you have to override the paintBackground and set the color to white.