List<Vector2> squareCorners = new List<Vector2>();

//grab the 2 I know of
Vector2 NWcorner = new Vector2( (float)NW.longitude, (float)NW.latitude);
Vector2 SEcorner = new Vector2( (float)SE.longitude, (float)SE.latitude);

// now get the other 2
Vector2 NEcorner = new Vector2( Math.Max(NWcorner.x, SEcorner.x), Math.Max(NWcorner.y, SEcorner.y );
Vector2 SWcorner = new Vector2( Math.Min(NWcorner.x, SEcorner.x), Math.Min(NWcorner.y, SEcorner.y );

// add them all to the list
squareCorners.Add(NWcorner);
squareCorners.Add(NEcorner);
squareCorners.Add(SEcorner);
squareCorners.Add(SWcorner);

// create the poly
OnlineMapsDrawingPoly mySquare = new OnlineMapsDrawingPoly(squareCorners, Color.gree, 1.0f, Color.cyan);
// add it to the map
OnlineMapsDrawingElementManager.AddItem(mySquare);

This does work.

Now I'm on to making it clickable, which I think I can handle

Basically, I'm going to draw a square and make it clickable, and allow the user to easily jump to this location. 
There could be several of these squares drawn at once.

I have a simple 2d map that will serve as a context map of sorts, and it will have these "buttons" on it representing all of the important areas.

I'm using data provided to me from a 3rd party and all they give are the TL and BR coords for each area.

A 2nd 3D map will display the zoomed in version of these selected areas

There are many ways to do this for example OnlineMapsDrawingRect + OnlineMaps.GetCorners.
https://infinity-code.com/doxygen/onlin … gRect.html
https://infinity-code.com/doxygen/onlin … d91edd9f1c

The best way depends a lot on what this square is for.

I figured I could try to find the center point between them and draw a square, but then how do I figure out the scale so the square stops are the coordinates?

or maybe you have a better approach?

Thanks in advance