Opacity<1.0 && !FormBorderStyle.None

Question

I would like to have a transparent window that is resizable. However, if i make a dialog with an opacity of less than 1 and a border style that is not 'None', when i move the window, the transparency is lost, and i sometimes get the following exception: 'An unhandled exception of type 'System.ComponentModel.Win32Exception' occurred in system.windows.forms.dll' Any idea how i can resolve this issue?