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ShellBrowser Delphi Components Documentation | 
Adds a single TShellColumnId item to the list.
function Add(pShellColumnId: TShellColumnId): Integer; overload;
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Parameters  | 
Description  | 
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pShellColumnId: TShellColumnId  | 
 A TShellColumnId that serves as identifier of the column.   | 
The insert position.