asp.net 4.0 - When I create a custom control that inherits from HtmlContainerControl, I can't get it to show up in the VS Toolbox -

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asp.net 4.0 - When I create a custom control that inherits from HtmlContainerControl, I can't get it to show up in the VS Toolbox -

i've tried 2 methods include custom command in toolbox.

first, tried drag dll onto toolbox, of controls appeared.

again, when did "choose items" way, of controls appeared.

any of custom controls inherit web.ui.htmlcontrols.htmlcontainercontrol don't show up.

however, if alter controls' classes inherit web.ui.panel instead, show up.

what missing?

thanks

did decorate attributes toolboxitem?

asp.net asp.net-4.0

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