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Thanks Mad Hatter. I ended up not needing the IExtenderProvider. Here was my solution


// for intercepting clicks to select different plots
class MessageFilter : IMessageFilter
...

It looks like there is indeed no easy solution to this then. So be it. Thanks for the help.

Having written a couple widgets libraries myself, I tend to think that the hierarchy should be kept in the framework and that messages should pass from the top down rather than to the one component...

I was hoping to avoid that kind of ugly solution, since it's one more thing to maintain when new things are added down the line. I'll do it if it's the only option, but only then.

My first and most important question is how does one capture a click event before any of the child controls? I have multiple panels that have different controls in them, and whenever I click anywhere...