Error: Object reference not set to an instance of an object

[HansW]

Hi there,
I have a class with the following method in it:

 
Public Class RedControlTracker
    Dim frmainInst As New frmMain

    Sub New()
        ' Constructor
        GetRedControl()
    End Sub

    Public Function GetRedControl() As Control
        Dim c As Control
        For Each c In frmainInst.Panel3.Controls
            If c.BackColor.Equals(Color.Red) Then
                Return c
            End If
        Next
    End Function
End Class

I have a button in my frmMain form with the following code:

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Dim c As New RedControlTracker
        MessageBox.Show("Name of the Red Control is: " & c.GetRedControl.Name)
    End Sub

When I press the button I get the following error:
Object reference not set to an instance of an object

What am I doing wrong?

There is a control with red backround in my Panel3 control. I have not had this error before, probably because my knowledge of classes is very limited. I can get it to work, doing all the coding in my frmMain (form) class, but it is getting kind of crouded.
Thank you for any help,
Hans