Set borders radius for link annotation, 3 values as RectangleF(x1,x2, x3, xIgnored) where x1 is horizontal radius, x2 is vertical radius, x3 is a border width To remove borders set all values to zero so it will be .Borders = new RectangleF(0,0,0,0); By default no brders radius is defined, and most readers are drawing rectangles around links deciding on their own.

public RectangleF Borders { get; set; }

Public Property Borders As RectangleF
	Get
	Set

public:
property RectangleF Borders {
	RectangleF get ();
	void set (RectangleF value);
}

member Borders : RectangleF with get, set