I want to confirm what I have seen from poking around here that I can use a TGraphicControl class to draw an outline on top of an existing control, a TPaintBox for example, with no painting of its background so I can still see the underlayer of the parent,The Paintbox?
I want to do this so I can capture all the mouse control when the cursor is within its boundaries but I still want the background control to show through except for where I made the drawing of the outline.
You can think of this as a high light marker on an image of a TPaintbox but able to capture all mouse input within it.
I know how to do this from the Windows API with transparent windows but I want something that works across the lake.