Refresh an UltraWinGrid from a separate form - vb.net

Question

I've got a form with a list of customers and another form where customers can be added. When I open the fAddCustomer form, from fCustomerList, I'm calling it using this code:
Dim f As New Form
f = New fAddCustomer(con, False)
f.MdiParent = Me.MdiParent
f.Show()
On fCustomerAdd, I've got a ToolStripButton to add the customer. When the form is closed, I need to refresh the UltraWinGrid that I have on fCustomerList to view the new data on the list automatically.
Because I'm using a ToolStripButton and the form uses f.MdiParent = Me.MdiParent, I can't use the same solution that was used in this answer here, as there is no DialogResult on a ToolStripButton, and you can't use ShowDialog when using MdiParents.
Is there any other way I can achieve this at all?

Answer 1

Here's a simple example:
' ... in fCustomerList ...
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim f As New fAddCustomer(con, False)
f.MdiParent = Me.MdiParent
AddHandler f.FormClosed, AddressOf f_FormClosed
f.Show()
End Sub
Private Sub f_FormClosed(sender As Object, e As FormClosedEventArgs)
' ... refresh your UltraWinGrid ...
End Sub

Answer 2

One that you could achieve this without changing the DataSource passing as #Plutonix suggested is to do something like this:
Private Sub fAddCustomer_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing
Try
If Application.OpenForms.OfType(Of fCustomerList).Any Then
Application.OpenForms("fCustomerList").Close()
Dim f As New fCustomerList()
f.MdiParent = Me.MdiParent
f.Show()
End If
Catch ex As Exception
Debug.WriteLine(ex.Message)
End Try
End Sub