diff --git a/conductorpropertieswidget.cpp b/conductorpropertieswidget.cpp
index a27c297ac..af79f32da 100644
--- a/conductorpropertieswidget.cpp
+++ b/conductorpropertieswidget.cpp
@@ -43,7 +43,7 @@ ConductorPropertiesWidget::ConductorPropertiesWidget(const ConductorProperties &
 /// construit l'interface du widget
 void ConductorPropertiesWidget::buildInterface() {
 	
-	setFixedSize(380, 280);
+	setMinimumSize(380, 280);
 	
 	QVBoxLayout *main_layout = new QVBoxLayout(this);
 	
diff --git a/configdialog.cpp b/configdialog.cpp
index 149928cb4..0650dcb93 100644
--- a/configdialog.cpp
+++ b/configdialog.cpp
@@ -25,7 +25,6 @@
 ConfigDialog::ConfigDialog(QWidget *parent) : QDialog(parent) {
 	
 	setWindowTitle(tr("Configurer QElectroTech"));
-	setMinimumSize(900, 400);
 	
 	// liste des pages
 	pages_list = new QListWidget();
diff --git a/diagramview.cpp b/diagramview.cpp
index d9c530118..262c92ba6 100644
--- a/diagramview.cpp
+++ b/diagramview.cpp
@@ -605,6 +605,10 @@ void DiagramView::dialogEditInfos() {
 	diagram_size_box_layout.addWidget(columns_width,  0, 2);
 	diagram_size_box_layout.addWidget(ds2,            1, 0);
 	diagram_size_box_layout.addWidget(columns_height, 1, 1);
+	diagram_size_box_layout.setColumnStretch(0, 1);
+	diagram_size_box_layout.setColumnStretch(1, 1);
+	diagram_size_box_layout.setColumnStretch(2, 1);
+	diagram_size_box_layout.setColumnStretch(3, 500);
 	
 	InsetPropertiesWidget *inset_infos = new InsetPropertiesWidget(inset, false, &popup);
 	
@@ -617,6 +621,7 @@ void DiagramView::dialogEditInfos() {
 	QVBoxLayout layout_v(&popup);
 	layout_v.addWidget(diagram_size_box);
 	layout_v.addWidget(inset_infos);
+	layout_v.addStretch();
 	layout_v.addWidget(&boutons);
 	// si le dialogue est accepte
 	if (popup.exec() == QDialog::Accepted) {
@@ -775,6 +780,7 @@ void DiagramView::editConductor(Conductor *edited_conductor) {
 	conductor_dialog.setWindowTitle(tr("\311diter les propri\351t\351s d'un conducteur"));
 	QVBoxLayout *dialog_layout = new QVBoxLayout(&conductor_dialog);
 	dialog_layout -> addWidget(cpw);
+	dialog_layout -> addStretch();
 	QDialogButtonBox *dbb = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
 	dialog_layout -> addWidget(dbb);
 	connect(dbb, SIGNAL(accepted()), &conductor_dialog, SLOT(accept()));
diff --git a/editor/elementscene.cpp b/editor/elementscene.cpp
index 944bb3727..c3bc00622 100644
--- a/editor/elementscene.cpp
+++ b/editor/elementscene.cpp
@@ -589,7 +589,7 @@ void ElementScene::slot_editOrientations() {
 	// cree un dialogue
 	QDialog dialog_ori;
 	dialog_ori.setModal(true);
-	dialog_ori.setFixedSize(400, 260);
+	dialog_ori.setMinimumSize(400, 260);
 	dialog_ori.setWindowTitle(tr("\311diter les orientations"));
 	QVBoxLayout *dialog_layout = new QVBoxLayout(&dialog_ori);
 	
@@ -608,7 +608,7 @@ void ElementScene::slot_editOrientations() {
 	QCheckBox *ic_checkbox = new QCheckBox(tr("Autoriser les connexions internes"));
 	ic_checkbox -> setChecked(internal_connections);
 	dialog_layout -> addWidget(ic_checkbox);
-	
+	dialog_layout -> addStretch();
 	// ajoute deux boutons au dialogue
 	QDialogButtonBox *dialog_buttons = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
 	dialog_layout -> addWidget(dialog_buttons);
@@ -635,7 +635,7 @@ void ElementScene::slot_editNames() {
 	// cree un dialogue
 	QDialog dialog;
 	dialog.setModal(true);
-	dialog.setFixedSize(400, 330);
+	dialog.setMinimumSize(400, 330);
 	dialog.setWindowTitle(tr("\311diter les noms"));
 	QVBoxLayout *dialog_layout = new QVBoxLayout(&dialog);
 	
diff --git a/elementspanelwidget.cpp b/elementspanelwidget.cpp
index 00825caef..746b390ad 100644
--- a/elementspanelwidget.cpp
+++ b/elementspanelwidget.cpp
@@ -90,7 +90,7 @@ void ElementsPanelWidget::newElement() {
 */
 void ElementsPanelWidget::newCategory() {
 	QDialog new_category_dialog;
-	new_category_dialog.setFixedSize(480, 280);
+	new_category_dialog.setMinimumSize(480, 280);
 	new_category_dialog.setWindowTitle(tr("Gestionnaire de cat\351gories"));
 	
 	QVBoxLayout *layout = new QVBoxLayout(&new_category_dialog);
diff --git a/exportdialog.cpp b/exportdialog.cpp
index 7b378ef75..157063caf 100644
--- a/exportdialog.cpp
+++ b/exportdialog.cpp
@@ -33,8 +33,9 @@ ExportDialog::ExportDialog(Diagram *dia, QWidget *parent) : QDialog(parent) {
 	diagram_ratio = (qreal)diagram_size.width() / (qreal)diagram_size.height();
 	dontchangewidth = dontchangeheight = false;
 	
-	// la taille du dialogue est fixee
-	setFixedSize(800, 360);
+	// la taille minimale du dialogue est fixee
+	setMinimumSize(800, 360);
+	resize(minimumSize());
 	setWindowTitle(tr("Exporter"));
 	
 	// le dialogue comporte deux boutons
@@ -52,6 +53,8 @@ ExportDialog::ExportDialog(Diagram *dia, QWidget *parent) : QDialog(parent) {
 	layout -> addWidget(leftPart(),  0, 0);
 	layout -> addWidget(rightPart(), 0, 1);
 	layout -> addWidget(buttons,     1, 1);
+	layout -> setColumnStretch(0, 1);
+	layout -> setColumnStretch(1, 500);
 	
 	setTabOrder(keep_aspect_ratio, buttons);
 	
@@ -200,6 +203,7 @@ QWidget *ExportDialog::leftPart() {
 	
 	/* un cadre permettant de specifier les options de l'image finale */
 	vboxLayout -> addWidget(setupOptionsGroupBox());
+	vboxLayout -> addStretch();
 	
 	// ordre des input selectionnes avec la touche tab
 	setTabOrder(filename, button_browse);
@@ -222,7 +226,7 @@ QWidget *ExportDialog::rightPart() {
 	
 	// la partie droite contient une GroupBox intitulee "Apercu"
 	QGroupBox *groupbox_preview = new QGroupBox(tr("Aper\347u"), this);
-	groupbox_preview -> setFixedWidth(390);
+	groupbox_preview -> setMinimumWidth(390);
 	QHBoxLayout *hboxlayout1 = new QHBoxLayout(groupbox_preview);
 	hboxlayout1 -> setMargin(0);
 	
diff --git a/insetpropertieswidget.cpp b/insetpropertieswidget.cpp
index 202d1c66b..6c714d009 100644
--- a/insetpropertieswidget.cpp
+++ b/insetpropertieswidget.cpp
@@ -29,7 +29,7 @@ InsetPropertiesWidget::InsetPropertiesWidget(const InsetProperties &inset, bool
 	QVBoxLayout *this_layout = new QVBoxLayout(this);
 	this_layout -> setContentsMargins(0, 0, 0, 0);
 	QGroupBox *inset_infos = new QGroupBox(tr("Informations du cartouche"), this);
-	inset_infos -> setMinimumWidth(300);
+	inset_infos -> setMinimumSize(300, 260);
 	this_layout -> addWidget(inset_infos);
 	
 	inset_title = new QLineEdit(this);
@@ -53,6 +53,8 @@ InsetPropertiesWidget::InsetPropertiesWidget(const InsetProperties &inset, bool
 	layout_date -> addWidget(inset_current_date, 1, 0);
 	layout_date -> addWidget(inset_fixed_date,   2, 0);
 	layout_date -> addWidget(inset_date,         2, 1);
+	layout_date -> setColumnStretch(0, 1);
+	layout_date -> setColumnStretch(1, 500);
 	
 	inset_filename = new QLineEdit(this);
 	inset_folio = new QLineEdit(this);