Windowless Taskbar Button

Question

I would like to create a windowless taskbar button, just like Windows Live Messenger does it:

How can I do that in C#? The Windows API Code pack looks helpful, but I haven't found any way to create a taskbar button with it.

Answer 1

Create a hidden window (CreateWindow and then ShowWindow(hwnd, SW_HIDE). This is will make the taskbar show an icon.

Then use the ITaskbarList, ITaskbarList2, ITaskbarList3, ITaskbarList4 APIs to set a different thumbnail for the window.