Show combobox drop down while editing text <p>When I first load my form the combobox functions as desired:</p> <p><img src="https://i.stack.imgur.com/ff7SV.jpg" alt="enter image description here"></p> <p>Then when I select one of the drop down menu items (via cursor or arrow keys &amp; enter):</p> <p><img src="https://i.stack.imgur.com/Re6B7.jpg" alt="enter image description here"></p> <p>Now if I try to edit the text in the combo box again (via cursor or arrow keys), the drop down menu no longer appears:</p> <p><img src="https://i.stack.imgur.com/fQu9f.jpg" alt="enter image description here"></p> <p>Currently my load form method:</p> <pre><code>Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load 'connect to RFDB Dim connectionString = My.Settings.RFDBConnectionString Dim connection As New SqlConnection(connectionString) connection.Open() 'Get Versions Table from RFDB Dim versions As DataTable Dim query = "select LocationID, VersionsNum, Description, PlanetExport from Versions inner join VersionsBuild on VersionsBuildID=IDVersionsBuild" versions = QueryRFDB(query, connectionString) 'Fill ComboBox with possible site versions Dim source As New AutoCompleteStringCollection() Dim i As Integer For i = 0 To versions.Rows.Count - 1 Dim siteVersion As String siteVersion = versions.Rows(i)(0) &amp; " V" &amp; versions.Rows(i)(1) &amp; " " &amp; versions.Rows(i)(2) source.Add(siteVersion) Next i Me.ComboBox1.AutoCompleteCustomSource = source Me.ComboBox1.AutoCompleteMode = AutoCompleteMode.Suggest Me.ComboBox1.AutoCompleteSource = AutoCompleteSource.CustomSource 'Fill ListBox with currently flagged site versions For i = 0 To versions.Rows.Count - 1 Dim siteVersion As String siteVersion = versions.Rows(i)(0) &amp; " V" &amp; versions.Rows(i)(1) &amp; " " &amp; versions.Rows(i)(2) If versions.Rows(i)(3) = True Then Me.ListBox1.Items.Add(siteVersion) Next i End Sub 'Returns a data table as the result of the sql query on RFDB Private Function QueryRFDB(ByVal query As String, ByVal connectionString As String) Dim adapter As New SqlDataAdapter(query, connectionString) Dim table As New DataTable adapter.Fill(table) Return table End Function </code></pre> <p>I am thinking it is maybe a settings issue with my combobox? Any help is appreciated. </p>