How to add FlashControl in the Visual Studio 2005/2008 Toolbox (or Visual Web Developer Express) ?
Put FlashControl.dll somewhere on your hard drive, “C:\temp\” for example. Now in Visual Studio, open the Toolbox window, right-click on a tab (you can create a new one if you want) and select “Choose items…”, then on the “.Net Framework components” tab click “Browse…” and select the “FlashControl.dll” file located in “C:\temp\” directory. Finally click the “OK” button and FlashControl appears on the Toolbox. Now you can drag and drop it on your webform in the Visual Studio designer !