I had a lot of problems with the bound combobox on a tabpage when
using the currency manager. However i didnt use the CM to move from
record to record, just used it to refresh the dataset so it knew it
had changed.
If you are using VS 2003, then i think the problem is easier to solve,
as you can use the DropDown style and then bind to the Text property.
Then you just need to handle the keyboard entry so the user cannot
change the value (so it acts like DropDownList). I created a custom
control in the end for it which did just that and then used my combo
box rather than the system.windows.forms one

If you are thinking of going this route then the class was as follows:

Public Class BindableCombo
Inherits System.Windows.Forms.ComboBox

Private m_bIsReadonly As Boolean = True
Public Property IsReadonly() As Boolean
Get
Return m_bIsReadonly
End Get
Set(ByVal Value As Boolean)
m_bIsReadonly = Value
End Set
End Property

Private Sub BindableCombo_KeyDown(ByVal sender As Object, ByVal e
As System.Windows.Forms.KeyEventArgs) Handles MyBase.KeyDown
If m_bIsReadonly Then
e.Handled = True
End If
End Sub

Private Sub BindableCombo_KeyPress(ByVal sender As Object, ByVal e
As System.Windows.Forms.KeyPressEventArgs) Handles MyBase.KeyPress
If m_bIsReadonly Then
e.Handled = True
End If
End Sub

End Class

I think there are some other things you have to handle, but you get
the idea.

Now, if you are using VS.NET 2002, like myself, then this wont work as
the above code for handling the keystrokes does not work in the combo
in vs.net 2002!

I ended up with a pretty strange workaround, but one that works. I
basically add a simple bind and a complex bind to each combobox (i
noticed this becuase one of the cbo's i had was working fine. It was a
list of users which i read from the database so the user could select
one. The list was complex bound to the cbo and the user selection was
simple bound).

I create a dummy datatable, which in my case was created from the
items in the combo (as they were hard coded and added in using the
designer) as follows:

Dim dt As New DataTable("List")
Dim col As DataColumn = New DataColumn("Description", GetType(String))

dt.Columns.Add(col)
Dim dr As DataRow
Dim ob As Object

For Each ob In cbo.Items
dr = dt.NewRow()
dr("Description") = CType(ob, String)
dt.Rows.Add(dr)
Next ob

Then i cleared the items list:

cbo.Items.Clear()

Then added both bindings as follows (note that i bind to the
'SelectedValue' column):

cbo.DataBindings.Add("SelectedValue", datasource, datamember)
cbo.DataSource = dt
cbo.DisplayMember = "Description"
cbo.ValueMember = "Description"

The "Description" is from the dummy dt i created above. The datasource
and datamamber are what they would be normally.

I actually created a function to do this as i had many cbo boxes on
each screen.

In addition to this, if you are still awake, i had to add some code
depending on if the cbo was on the first tab that was displayed on the
screen or not.

After loading the screen and binding each control (in the code), i
refresh the CM.

This all seems to work for me, i can even have the cbo drop style set
to DropDownList so there is no problem with the user editing the
value.

One other thing to mention that i noticed that you may or may not be
having poblems with is that i had to set the cm.position to itself
before checking if the dataset had changed.

I hope all of this helps and is relevant, it sounds like you were
having similar problems to myself, so i thought i'd share this lot
with you. It took a lot of head scratching to get to where i am

MB



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