Hi, I have an NChartControl with an NGridSurface Series plotted on it. I am trying to use GDI drawing to create a rectangle on the surface of this plot. What I want is when I click the mouse on the plot, a rectangle is drawn. The problem I am having is that when I click on the NChart, I can not see the rectangle. I do not know if it is being drawn under the control or if it is being drawn at all. Here is the code I have so far:

Dim rect As Rectangle

Dim circlerect As Rectangle

Dim MoveFlag As Boolean

Dim DrawCircleFlag As Boolean

Dim DrawRectFlag As Boolean

Dim ClickX As Integer

Dim ClickY As Integer

Private Sub NChart_PColor_MouseDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles NChart_PColor.MouseDown

MoveFlag = True

If DrawRectFlag Then

rect.X = ClickX - CInt(rect.Width / 2)

rect.Y = ClickY - CInt(rect.Height / 2)

End If

NChart_PColor.Invalidate()

End Sub