As you probably already know, SQLDataSource et al can be found on the Toolbox
in the Data section. If your "custom datasource" control is written
correctly, you should be able to right click the Toolbox, "Choose Items",
then browse to your control's assembly and add it. At that point you should
be able to drag an instance of your customDataSource control onto the page
design surface and set its properties.
-- Peter
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