Create-child-window-once-and-activate-if-requested

Using the Wealth-Lab Client Extension API (see https://www.wealth-lab.com/Support/ExtensionApi/WealthLabClientExtension) I created a new Child Window.

This Opens when I click Extensions->MyNewChildWindow. Fine.

Now, while this window is open (and probably iconified or otherwise hidden), when I click Extensions->MyNewChildWindow again:
* a new Window is shown
* How can I prevent this?
* Instead I want my Child Window activated. i.e. de-iconify, bring to top, bring into view.

I tried to remember if the window already exists and call

CODE:
 MyClientHost.ChildWindowActivated(cw);

but this seems to have no effect.

I noticed the Log Viewer window behaves like that. How does it do it?