The best method I've found is to just remove all native controls (by uncommenting a directive in the air xml file, and adding showChrome="false" to your WindowedApplication). From there, it's pretty trivial to mimic native functions. Here's the ones used for beta 3 (they changed it, so googling around gets confusing):
this.nativeWindow.minimize(); // minimizes the window this.nativeWindow.close(); // closes the window this.nativeWindow.startResize(); // call this within a MouseDown event on your resizing handle this.nativeWindow.startMove(); // call this within a MouseDown event on your moving handle (title bar) All assuming this is the current window. - Kyle
