Código
no exemplo as labels devem ter a propriedade DRAGMODE=AUTOMATIC}
procedure TForm1.Panel1DragOver (Sender. Source: TObject; x,y:Integer; State:TDragState; var Accept: Boolean);
begin
Accept:=Source is Tlabel;
end; procedure TForm1.Panel1DragDrop (Sender. Source: TObject; x,y:Integer);
begin
Panel1.color:=(Source as Tlabel).Color;
end;
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