dynamically added widgets inaccessable in Qt - c++

Question

I have a subclassed QToolButton(in a toolbar added to mainwindow with addToolBar() ) that works as a "drag and drop button" dynamically generating subclassed QWidgets( which contain just 1 QTextEdit) on the central Widget of a QMainWindow which is a QWidget. The drag and drop works fine.
However unless the user accesses them in a very specific order, only one of the QTextEdit widgets stays accessible after which the others do not respond to mouse clicks and the whole central Widget is "stuck".
By that i mean any other widgets who are children of the central widget are unresponsive.
Why is that? Does it have something to do with focus policies possibly?
EDIT:
Thanks to SpongeBobs comment, where he suggested to test plain QTextEdit generating instead of a whole custom class, we know that the error is somewhere in the custom class ideafield. So how do I change it to get the appropriate behavior?
#ifndef IDEAFIELD_H
#define IDEAFIELD_H
#include <QWidget>
#include <QTextEdit>
#include <QFrame>
class IdeaField : public QWidget
{
Q_OBJECT
public:
explicit IdeaField(QWidget *parent = 0);
void move_all(int,int);
void move_all(QPoint);
QTextEdit *textField;
signals:
public slots:
};
code:
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
this->setStyleSheet("background-color: white;");
ideaPlane = new IdeaPlane(this);
setCentralWidget(ideaPlane);
MainWindow::createToolBars();
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::createToolBars()
{
QToolBar * topToolBar = addToolBar(tr("Title"));
dragIdeaButton = new dragButton(this);
topToolBar->addWidget(dragIdeaButton);
}
ideafield.cpp: subclassed QTextEdit:
#include "ideafield.h"
IdeaField::IdeaField(QWidget *parent):QWidget(parent)
{
textField = new QTextEdit(this);
textField->setFrameShape(QFrame::StyledPanel);
textField->setPlainText(tr("TEST TEXT\nHURRAY!"));
}
void IdeaField::move_all(int x,int y)
{
textField->move(x,y);
}
void IdeaField::move_all(QPoint point)
{
textField->move(point);
}