Datagridviewcombobox Will Not Stay Dropdown

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VB

DataGridView

I found some code here and there and was able to come up with some code to change the style of the DGVCombobox to a dropdown instead of droplist. It works fine by itself, but when I add more code in the EditingControlShowing handler to address another control type (stop user from entering anything but a decimal number in a textbox in column 3) it breaks. When I select another cell after selecting the handled textbox, the DGVCombobox stops working. If I comment out the code to handle column 3 textbox, the code for handling the combobox type works again. Am I missing something obvious?

'Allow user to enter new values for ALL DataGridViewComboBox controls in the DataGridView
If (TypeOf e.Control Is DataGridViewComboBoxEditingControl) Then
    Dim cmb As DataGridViewComboBoxEditingControl = CType(e.Control, DataGridViewComboBoxEditingControl)
    If Not cmb Is Nothing Then
        cmb.DropDownStyle = ComboBoxStyle.DropDown
    End If
End If
' stop user from entering anything but a decimal number with 2 decimal places into column 3
If (TypeOf e.Control Is DataGridViewTextBoxEditingControl) Then
    If (JobComponentsDataGridView.CurrentCell.ColumnIndex = 2) Then
        Dim textBox As TextBox
        textBox = CType(e.Control, TextBox)
        If (Not (textBox) Is Nothing) Then
            AddHandler textBox.KeyPress, AddressOf DataGridViewTextColumn_KeyPress_NumericOnly
            RemoveHandler Me.JobComponentsDataGridView.EditingControlShowing, AddressOf JobComponentsDataGridView_EditingControlShowing
        End If
    End If
End If