I created a new folder in my projectoverview, rightclick "New"->"Gui Style". After that i put 4 images under this style (Back, Border, Corner Top). Then i draged droped the 4 images to the Style Editor, but only the Backimage will be shown in the preview.

But "Duplicating" a style and doing the same steps, it works perfektly!

Hello,

Please check the alpha component of color values in the properties for border color.

ahh thanks, perhaps this should be 255 too in new?