Print to a Text Box on a User Form from VBA Module

Hello All, I am in need of some expert guidance to an issue I have.

Basically, I have created a User Form with some buttons on the form that trigger different Modules of VBA. This all works fine but as some of the VBA Modules take a long time to process the various tasks that they do, I need to show the user what is actually happening in the back-round via some text in a text box. I added a text box to the User form, I added a new button to the User form and I was able to write text to the Text Box using the following code:-

Public Sub CommandButton5_Click()
Dim strText As String
Dim blnClear As Boolean
blnClear = True

strText = "Operation Completed"
Call WriteToLogText(strText, 1)
End Sub
Public Sub WriteToLogText(strText As String, Optional blnClear As Boolean = False)

textlog.SetFocus
If blnClear = True Then
textlog = strText
Else
textlog = textlog.Text & Chr(13) & Chr(10) & strText
End If
End Sub

When I tried to use the above code in other modules it does not work as the code fails on the statement "textlog.SetFocus". I am assuming that this is because the code is running external to the user form.

My question is can I pass text into the named text box on the User Form from other modules.

Any assistance would be greatly appreciated.

Regards

Ian