How to fetch the the object with the highest index in a list of buttons ?

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buttons

ListControl

ClickOnce

I have created a click event for 4 buttons click, where if a button is clicked it is added to a list called buttonslist. Now all I need to do is to check if the button with the highest index out of 4 backcolor is red or blue. (program - visual basic 2010)
What do you guys suggest me ?

What I have tried:

this is my code for this part :

Dim buttonList As New List(Of Button)

Private Sub buttons_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles b1.Click, b4.Click, b5.Click, b8.Click
    Dim selectedBtn As Button = sender
    buttonList.Add(selectedBtn)
End Sub

Public Sub checkitems()
    For Each b As Button In buttonList
        If b.BackColor.Equals(buttonList(3).BackColor) AndAlso buttonList(3).BackColor = Color.Red Then
            Label5.Text += 1
        Else
            Label6.Text += 1
        End If
    Next
End Sub