Accessing a button in ASP.Net Wizard CustomNavigationTemplate

Hello,

I have got a Wizard with StartNavigationTemplate, StepNavigationTemplate and FinishNavigationTemplate. All of them have a button with ID btnSave while the FinishNavigationTemplate has another button with id btnFinish. I am trying to save draft while Save is clicked and Submit when submit is clciked. 

My problem is that I can't figure out how to access the ID of the button on which I am basing my conditions. I tried the following code:

Dim btnSaveForm As Button = CType(sender, Button)
        Dim btnSave As Button= TryCast(form1.ActiveStep.FindControl("btnSave"), button)
        Dim btnFinish As button= TryCast(form1.ActiveStep.FindControl("btnFinish"), button)

Is that the correct way of accessing the button in a wizard footer template or am I doing it wrong? Thank you for your time.