On click Treeview

Public Event NodeMouseClick As TreeNodeMouseClickEventHandler
    Sub treeView1_NodeMouseClick(ByVal sender As Object, _
    ByVal e As TreeNodeMouseClickEventArgs) _
    Handles TreeView1.NodeMouseClick
        If e.Node.Text.Equals("Tab 1") Then
            TabControl1.SelectedTab = TabPage1
        ElseIf e.Node.Text.Equals("Tab 2") Then
            TabControl1.SelectedTab = TabPage2
        End If
    End Sub

Fik det til at virke ;)