Draw Line in Layout View with ArcObjects

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I'm trying to draw a line on layout view on ArcMap with C# and ArcObjects. I'm working on this sample. But I have some problems.

1.) This code for draw line on data view but I need to draw line on layout view(In box frame).I want to see properties of line element when I selected my line Item.

2.) When I click on this line in ArcMap, It become invisible..why is this happening?

This is Code Sample :

protected override void OnClick()

{ //drawing a polyline Point p1 = new PointClass(); p1.X = 10; p1.Y = 10; IPoint p2 = new PointClass(); p2.X = 20; p2.Y = 20; IPoint p3 = new PointClass(); p3.X = 35; p3.Y = 15; IPoint p4 = new PointClass(); p4.X = 40; p4.Y = 17; IPoint p5 = new PointClass(); p5.X = 50; p5.Y = 19; IPoint p6 = new PointClass(); p6.X = 60; p6.Y = 18; IPolyline polyline = new PolylineClass(); IPointCollection pointColl = polyline as IPointCollection; pointColl.AddPoint(p1); pointColl.AddPoint(p2); pointColl.AddPoint(p3); pointColl.AddPoint(p4); pointColl.AddPoint(p5); pointColl.AddPoint(p6); IMxDocument mxdoc = ArcMap.Application.Document as IMxDocument; IActiveView activeView = mxdoc.ActiveView; IScreenDisplay screenDisp = activeView.ScreenDisplay; short screenCache = Convert.ToInt16(esriScreenCache.esriNoScreenCache); screenDisp.StartDrawing(screenDisp.hDC, screenCache); IRgbColor color = new RgbColorClass(); color.Red = 0; color.Blue = 0; color.Green = 0; ISimpleLineSymbol simpleLineSymbol = new SimpleLineSymbolClass(); simpleLineSymbol.Color = color; simpleLineSymbol.Width = 1; screenDisp.SetSymbol(simpleLineSymbol as ISymbol); screenDisp.DrawPolyline(polyline); screenDisp.FinishDrawing(); }

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