Echo Web Framework

Hello

I have two problems with WindowPane
1. Minimize window (how it's work, I press the minimize button and nothing)

window.setMinimizeEnabled(true);

2. Problem with PNG images in Borders(If image is with transaparency color (fill image doesn't work))
but if I use the same image without transaparence color it's working.

How can I create same WindowPane as in demo application (almost invisible)
Plese send mi some example code