I'm trying to use the WindowDockState = windowdockstatefloating! property, but it doesn't seem to work. I understand it is supposed to let the user drag a MDI sheet window outside the MDI frame? I have tried to change the window property, and also to change it in script where I get the error "A systemwrite property can be modified only in an event or function in its parent class." Has anybody gotten this to work in PB 2017? I'm on Windows 10.