Mac: When drag resizing or moving a window on Mac the cursor is lost

I am trying to write code to implement resizable windows from all 4 sides and corners. I set the cursor to one of the RESIZE cursors on mouse enter of one of the edges of the window. When I start resizing or moving and resizing the window the cursor returns to default pointer.

I have attached the window resize class I am working on, just create a instance passing in the root Region and the stage.