This Post Details Content That I Have Written Regarding The SharePoint API On MSDN. The Full Article Will Have These Contents As Annotations Of The Full Article.
I Encourage You To Read The Full MSDN Class Documentation, Since Things Like Type Hierarchy Are Illustrated.
Adam Buenz’s MSDN Located At Annotations edited by Adam Buenz – MVP:
Description The Microsoft.SharePoint.WebControls.WebPartGalleryPicker inherits from the System.Web.UI.Control base class in order to define a new server control. Within the shipped software, the WebPartGalleryPicker is immediately apparent when you are adding a new WebPart to a WebPartPage, characterized by the popup dialog that conditionally presents available WebParts. The class relies on two separate WebPart containment hierarchy objects, WebPartInfo and and WebPartData.
Read My Complete MSDN Article: WebPartGalleryPicker