Combo Box triggers another comboxbox display

[dr223]

Hi,

On my form I have 3 combo boxes,

CmbTruckTyp (has dropdownlist of Daf & Mercedes Benz)
cmbDafModels (A, B , C)
cmdMercBenzModels (D, E, F)


On Form Load (by default)

Select Truck Type = CmbTruckTyp (Daf is at the top) Select Model = cmbDafModels (set to visible at form load and cmdMercBenzModels set to false)

Now when a user from the dropdownlist on CmbTruckTyp select Mercedes Benz I want to hide the contents of cmbDafModels and display cmdMercBenzModels instead.

How can I achieve that? Is it the right approach to do it? I might have other 3 combo boxes to add...

Tried;

Private Sub CmbTruckTyp_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CmbTruckTyp.SelectedIndexChanged

        If Me.CmbTruckTyp.Text = "Mercedes-Benz" Then
            cmdMercBenzModels.Visible = True
        Else
            cmbDafModels.Visible = False
        End If

        If Me.CmbTruckTyp.Text = "Daf" Then
            cmbDafModels.Visible = True
        Else
            cmdMercBenzModels.Visible = False
        End If

    End Sub

No errors, but doesnt work!!

When I Select Mercendez Benz from the dropdownlist, cmbDafModels disappears but cmdMercBenzModels is not visible.
When I click Daf again cmbDafModels doesnt reappear.

Many thanks