Please refer to the code sample in VB:
Private Sub RadButton1_Click(sender As Object, e As EventArgs) Handles RadButton1.Click
AddHandler RadMessageBox.Instance.Shown, AddressOf Instance_Shown
Private Sub Instance_Shown(ByVal sender As Object, ByVal e As EventArgs)
Dim form As RadMessageBoxForm = TryCast(sender, RadMessageBoxForm)
form.TopMost = True
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