Originally Posted by Teme64

Set TopMost property of your pop up form

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VB.NET Syntax (Toggle Plain Text)

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
  '
  Me.TopMost = True
 
End Sub

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load ' Me.TopMost = True End Sub

After the user has somehow "reacted" to your pop up, you may set TopMost = False to allow user send your form to background.