Design-Time Support for Custom Controls
The custom controls you have explored so far are full of promise. Being able to drop a tool-like directory browser or thumbnail viewer directly into your application without writing a single line of extra code is a remarkable advantage. However, there is one caveat. Though your custom controls perform wonders at runtime, many of them act oddly while a form is being designed. By default, only user controls appear in the Toolbox, and even they only appear with a generic icon. Inherited controls need to be created in code, unless you create a similar control and manually edit the hidden designer instructions. Even if you use this trick, the results aren’t always what you expect.
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