Without seeing what exactly you have done it's impossible to give you a concrete advice.
You need to define the Click event in the Class where you can execute code.
If you need an event in the calling activity you must define one and call it from the event routine in the class.
In the class:
Private Sub btnTest_Click
' code internal to the class
If SubExists(CallbackModule, EventName & "_Click") Then
CallSub(CallbackModule, EventName & "_Click")
End If
End Sub
In the Activityy:
Sub clsTest_Click
End Sub
CallbackModule, EventName are the ones you transmit in the Initialize routine for the class.
Dim clsTest As MyClass
clsTest.Initialize(Me, "clsTest")