hi;

 i too am trying to get the close button to respond to a server-side event ( WindowStateChange ).  i have looked at the links suggested above and this is what i have done.   i did not understand the help link to the StateChanged Event.

 i have set the autopostback flag to true to windowstatechanged event.

  and i have created a server-side StateChanged event.

    Private Sub WebDialogWindow1_StateChanged(ByVal sender As Object, ByVal e As Infragistics.Web.UI.LayoutControls.DialogWindowStateChangedEventArgs) Handles WebDialogWindow1.StateChanged
        Stop
        If e.NewState = Infragistics.Web.UI.LayoutControls.DialogWindowState.Hidden Then
            If e.OldState <> Infragistics.Web.UI.LayoutControls.DialogWindowState.Hidden Then
                lblReturnedData.Text = "window is closed"
                lblReturnedData.Visible = True
            End If
        End If
    End Sub

  this event is never being fired.   is this all that is necessary to wire-up the StateChanged event?

  i do have the _Moved event server-side and it is being fired, however, it is fired after the window is closed.

Stop

End Sub

  Thanks for your help.