How I can set different border for Dialog. for bottom, top, left and right border. I need to set round angle for bottom left and right angles. But top angles have to be direct.
You can achieve it by 'Image Border Wizard' for DialogContentPane style.
Follow these steps
NOTE: If you want this new border to be done for all the dialogs than instead of creating new style 'MyDialogContentPane' you reuse the 'DialogContentPane' style with the above steps.
I would recommend you to go through the Shai's blog posts 'LWUIT Resource Editor Tutorial Part 1' till part 10. To better understand the Resouce Editor its features and capabilities.