Promote to Custom Widget makes the widget disappear !

[madcat]

Hi,
I want to be able to do drag & drop on a QListWidget, so I chose to subclass it. To do so, in Designer I selected it and clicked "Promote to custom widget", I named the new class FileList. I also created filelist.h, which I post there :

#include <QtGui>
 
class FileList : public QListWidget {
    Q_OBJECT
 
public:
    FileList (QWidget *parent = 0);
    void dragEnterEvent (QDragEnterEvent *event);
    void dropEvent (QDropEvent *event);
};

#include <QtGui>

class FileList : public QListWidget {
    Q_OBJECT

public:
    FileList (QWidget *parent = 0);
    void dragEnterEvent (QDragEnterEvent *event);
    void dropEvent (QDropEvent *event);
};

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I also created filelist.cpp, to implement drag & drop functions :

#include "filelist.h"
 
FileList::FileList (QWidget *parent) : QListWidget(parent) {
}
 
void FileList::dragEnterEvent (QDragEnterEvent *event) {
    if(event->mimeData()->hasFormat("text/uri-list"))
        event->acceptProposedAction();
}
 
void FileList::dropEvent (QDropEvent *event) {
    qWarning(event->mimeData()->text().toAscii());
}

#include "filelist.h"

FileList::FileList (QWidget *parent) : QListWidget(parent) {
}

void FileList::dragEnterEvent (QDragEnterEvent *event) {
    if(event->mimeData()->hasFormat("text/uri-list"))
        event->acceptProposedAction();
}

void FileList::dropEvent (QDropEvent *event) {
    qWarning(event->mimeData()->text().toAscii());
}

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The problem is, in Designer preview, or in the final binary, the list does not appear anymore... Any clue ?