Controls that Load Default Images
Within Visual Studio 2008, all controls that load default images will not have their images display in the Quick Designer preview pane. When there are not any images specified in the preset file, the control tries to load the default image as an embedded resource;however, the URL returned using Visual Studio 2008 is invalid.
A workaround is available for this where you set the image URLs in the preset files instead of leaving them blank.
WebResizingExtender
Visual Studio 2008 does not support dragging Extenders from the toolbox on to your page in design view.
This change affects our WebResizingExtender control. However, you can drag the WebResizingExtender from the toolbox on to your page in source view. From this view, Visual Studio 2008 will generate the text for the new instance of the control and also the "@ Register Assembly.." text at the top of the page. After you add the WebResizingExtender through the source view, you can switch back to design view and set the properties of the WebResizingExtender control.
WebApplication Projects
There is a known issue with Visual Studio 2008 and the NetAdvantage for ASP.NET controls. When you create a WebApplication Project in Visual Studio 2008, dragging the ASP.NET controls from the tool box on to your page will not automatically add all the dependant references of the control to the project references. The control will appear correctly at design time but it will not compile at runtime.
A workaround to this known issue is to add the dependant references manually.
Click the following link for a list of all the ASP.NET controls and components included in each assembly.
