How do I keep an MDI_Child Form on top of all other child forms?

Just like a toolbox - I need to keep my 'toolboxes' on top at all times.

I have used the API 'SetWindowPos' function, but when another form is clicked, the toolbars go to the back.

I also need this to work only if the toolbars have been loaded and are visible in the first place.

Help???