Can I build a scalable drag window, selecting a corner of the same window, like OS Windows?Thanks.
the answer is yes of course. While I haven’t done it I have looked into it
http://unity3d.com/support/documentation/ScriptReference/GUI.Window.html
http://unity3d.com/support/documentation/ScriptReference/GUI.DragWindow.html
Using the event system you could put a box, or even just an area where the user could click and then drag and thus rescale the window. You’d have to use a 2d vector for the mouse’s change in position and then transfer it to two variables that hold the width and length of the rect for the window.
Not exactly simple, and probably fairly hardware intensive, but do able.