How to trigger WinForms button click from remote thread - vb.net

Question

I've got an application that I've developed in VB 2010. It consists of a series of Windows forms and a listener process which listens to input from a MIDI device (a keyboard etc). This listener process runs in a separate thread.
Using a callback function and the invoke method I can update the value of a text box on one of the forms with the value of the notes played on the MIDI device (code below).
What I can't seem to do is to trigger a button press on one of the buttons so that a piece of code runs on the same form using another callback function and invoke.
I've Googled around and can't find any working examples so I'm not sure that this is possible - I hope it is because this is the last 1% of my project !
Here's what works to update a text box on the form, what would I need to modify in order to click a button on the same form called btn_NextSection ?
' Because the MIDI listener process runs in a different thread
' it can read the states of controls on the parent form but it
' cannot modify them so we need to identify the parent process
' and update the text box as that one instead
' Set up the callback
Private Delegate Sub SetNextSectionTextCallback(ByVal [text] As String)
' Updates NextSection
Private Sub SetNextSectionText(ByVal [text] As String)
' Function to see if the thread that tries to update the
' text box is the same as the one that started it. If it
' isn't then locate parent process and update as that one
If callerInstance.txt_NextSection.InvokeRequired Then
Dim d As New SetNextSectionTextCallback(AddressOf SetNextSectionText)
callerInstance.Invoke(d, New Object() {[text]})
Else
callerInstance.txt_NextSection.Text = [text]
End If
End Sub
Thanks in advance !

Answer 1

Assuming that you want to run the code, not simulate the button click, try something like this. Invoke requires a function so you may need to create a dummy return object.
Private Sub btn_NextSection_Click(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles btn_NextSection.Click
NextSection()
End Sub
Private Function NextSection() As Object
'do something on the UI thread
Return Nothing ' to satisfy the requirements of Invoke
End Function
Private Sub AnotherThreadHere()
'call NextSection on the UI thread
Application.Current.Dispatcher.Invoke(Windows.Threading.DispatcherPriority.Background, New Action(Function() NextSection()))
End Sub