threading..killing a form

i have the code below:

VB Code:

Private Sub ShowWaitNotice()
 
        Dim WaitNotice As New WaitNotice
        WaitNotice.ShowDialog()
 
    End Sub
 
    Private Sub WizardFilterBuilder1_Search_Click() _
        Handles WizardFilterBuilder1.Search_Click
 
        Dim waitThread As New Threading.Thread(AddressOf ShowWaitNotice)
        waitThread.Start()
 
        'stuff to do here
 
        waitThread.Abort()
 
    End Sub

after the thread aborts, the 'please wait' form is still there. it will go away if the mouse runs over it. How do you make it die with the thread?