arcgis 10.0 - How to create a graphic point by xy value?

I have implemented this code to create point event layer by xy text file, however I'm wondering how to create a point graphic by xy value?

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  This script draws point graphic by mouse down. When I steer away from the mouse down event and input my xy values manually it does not draw.

  
  


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  Using the Point class looks like it might also be a solution, however I'm not sure how to implement this code without getting a null reference error on point.setX line.

  
  

Dim point As New Point()
point.setX(-100.0)  
point.setY(40)  
Dim markerElement As New MarkerElement()    
markerElement.setGeometry(point)

Dim map As IMap = mxdoc.FocusMap


Map.addElement(markerElement, 0)

Any suggestions on how to create a graphic point by xy value?

Thank You

Answer

In the ArcGIS Resource Center is a discussion about Working with map elements which gives you an example on how to create a Point:

Dim point As IPoint = New PointClass()
point.X = 0
point.Y = 0

Then you can use the AddGraphicToMap snippet to draw the graphic on the map using the supplied colors.