Scroll Listview items by text box

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At first I am totally new in VB 2008. In my project I Three textboxes and a listview. I can find the items of listview by 1st textbox change event. The codes are as given below:-

Private Sub sealv_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles sealv.TextChanged
	        Dim i As Integer
	        For i = 0 To LV1.Items.Count - 1
	            LV1.Items(i).BackColor = Color.White
	        Next
	        With LV1
	            lst = .FindItemWithText(sealv.Text, True, 0, True)
	            If Not lst Is Nothing Then
	                .Items.Item(lst.Index).EnsureVisible()
	                .Items.Item(lst.Index).BackColor = Color.YellowGreen
	            Else
	                For i = 0 To LV1.Items.Count - 1
	                    LV1.Items(i).BackColor = Color.White
	                Next
	                .Items.Item(0).EnsureVisible()
	                .Items.Item(0).BackColor = Color.YellowGreen
	            End If
	        End With
	        lst = Nothing
	    End Sub

Now, I want to learn the followings:-
1) How to scroll the listview items by textbox keyDown and KeyUp event.
2) And I want to get the listview focused item in the 2nd and 3rd textbox by 1st textbox keypress event( Enter press on keyboard).

Please help me regarding the above.