ImageList Transparency not working at runtime

Question

I am using 32bit PNG files with transparency. I added them to an image list with properties:

ColorDepth: Depth32Bit
TransparentColor: Transparent

When I assign the image to my toolbar button, it previews in Visual Studio fine with the correct transparency. But when I run the application the transparency is all messed up with black covering the semi-transparent regions.

How do I fix this?

Answer 1

If you add them directly to the toolbar without using an image list I think they will draw correctly.

Answer 2

The solution apparently is to put

Application.EnableVisualStyles();

Before the start of your application. This has fixed the transparency issue.

Solution Reference

MSDN on EnableVisualStyles