Cancelling the event that triggered an asynchorous call after the method finishes

Hi,

In an event handler of a tab chaged of a tabcontrol, I call a method asynchrounously, like this:

Private Sub tabDetails_Deselecting(ByVal sender As System.Object, ByVal e As System.Windows.Forms.TabControlCancelEventArgs) Handles tabDetails.Deselecting
' we pass pageindex so that we set the index back in case the validation fails
Dim params = New Object() {e.TabPage.Controls(0), e.TabPageIndex}
AsyncCaller.DoOperation(AddressOf AsyncSaveObject, params, AddressOf ShowSaveResult)
End subIs there a way when the method call finishes and ShowSaveResult returns to cancel the event tabDetails_Deselecting that triggered that method? like this:

e.cancel = true so that the tab goes back to the previous tab?

So far that did not work for me, is there any way to do that please?

Thanks