It would be easier to create your own dialog that uses the DatePicker widget. You can find an example of using the DatePicker widget in the sdk folder in the section:
ApiDemos/src/com/example/android/apis/view/DateWidgets1.java
ApiDemos/src/com/example/android/apis/view/DateWidgets2.java
Then you can put any buttons and actions that you want to use to select a date.
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