I have a regular form and if a certain condition comes up I want to pop up a small form/tooltip/message to the user. My first thought was to do a borderless form and have its opacity set to 80% and show the form when the condition arises. This works, but if I move the main form the message form stays put. I would like it better to show the message on the main form but I don't know what control to use that I can set opacity and some text on. What would be the best way to do this? I was figuring to show the message toward the bottom of the main form but still be able to see the forms contents behind the message. Hence why I want opacity.

Any suggestions?