Returns the name of a custom attribute that can be retrieved using the GetItemAttr method.
function GetAttr(Index: Integer): string; override;
virtual __fastcall AnsiString GetAttr(int Index);
TCollection descendants can associate user-defined attributes with the items in the collection. Each attribute has a name and, for each item in the collection, a value that is a string. The GetAttr method returns the name of an attribute.
Index identifies the attribute whose name is requested. This is a value between 0 and n-1, where n is the value returned by GetAttrCount.
As implemented by TCollection, GetAttr always returns an empty string, because TCollection defines no custom attributes.
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