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    <p>It feels like a bit home-worky, but you would need something like the code below. I have never tested it myself, and I have not even tried to compile it. However, this should be a good starting point to begin with.</p> <h3>dynamicpropertyplugin.h</h3> <pre><code> #ifndef DYNAMICPROPERTYPLUGIN_H #define DYNAMICPROPERTYPLUGIN_H #include &lt;QDesignerCustomWidgetInterface&gt; class QIcon; class QWidget; class DynamicPropertyPlugin : public QObject, public QDesignerCustomWidgetInterface { Q_OBJECT Q_INTERFACES(QDesignerCustomWidgetInterface) public: DynamicPropertyPlugin(QObject *parent = 0); QString name() const; QString group() const; QString toolTip() const; QString whatsThis() const; QString includeFile() const; QIcon icon() const; bool isContainer() const; QWidget *createWidget(QWidget *parent); bool isInitialized() const; void initialize(QDesignerFormEditorInterface *formEditor); QString domXml() const; private: bool initialized; }; #endif </code></pre> <h3>dynamicpropertyextension.h</h3> <pre><code>class DynamicPropertyExtension : public QObject, public QDesignerDynamicPropertySheetExtension { Q_OBJECT Q_INTERFACES(QDesignerDynamicPropertySheetExtension) public: DynamicPropertyExtension(QObject *parent = 0); int addDynamicProperty(const QString &amp; propertyName, const QVariant &amp; value); bool canAddDynamicProperty(const QString &amp; propertyName) const; bool dynamicPropertiesAllowed() const; bool isDynamicProperty(int index) const; bool removeDynamicProperty(int index); }; </code></pre> <h3>dynamicpropertyplugin.cpp</h3> <pre><code>#include &lt;QtDesigner&gt; #include &lt;QtGui&gt; #include &lt;QtPlugin&gt; #include "dynamicproperty.h" #include "dynamicpropertyplugin.h" #include "dynamicpropertyextension.h" DynamicPropertyPlugin::DynamicPropertyPlugin(QObject *parent) : QObject(parent) { initialized = false; } QString DynamicPropertyPlugin::name() const { return "DynamicProperty"; } QString DynamicPropertyPlugin::group() const { return "Display Widgets [Examples]"; } QString DynamicPropertyPlugin::toolTip() const { return ""; } QString DynamicPropertyPlugin::whatsThis() const { return ""; } QString DynamicPropertyPlugin::includeFile() const { return "dynamicproperty.h"; } QIcon DynamicPropertyPlugin::icon() const { return QIcon(); } bool DynamicPropertyPlugin::isContainer() const { return false; } QWidget *DynamicPropertyPlugin::createWidget(QWidget *parent) { DynamicProperty *dynamicProperty = new DynamicProperty(parent); dynamicProperty-&gt;setState("-X-XO----"); return dynamicProperty; } bool DynamicPropertyPlugin::isInitialized() const { return initialized; } void DynamicPropertyPlugin::initialize(QDesignerFormEditorInterface *formEditor) { if (initialized) return; QExtensionManager *manager = designerFormEditorInterface-&gt;extensionManager(); Q_ASSERT(manager != 0); manager-&gt;registerExtensions(new DynamicPropertyExtensionFactory(manager), Q_TYPEID(QDesignerDynamicPropertySheetExtension)); initialized = true; } QString DynamicPropertyPlugin::domXml() const { return QLatin1String("\ &lt;ui language=\"c++\"&gt;\ &lt;widget class=\"DynamicProperty\" name=\"dynamicProperty\"/&gt;\ &lt;customwidgets&gt;\ &lt;customwidget&gt;\ &lt;class&gt;DynamicProperty&lt;/class&gt;\ &lt;propertyspecifications&gt;\ &lt;stringpropertyspecification name=\"state\" notr=\"true\" type=\"singleline\"/&gt;\ &lt;/propertyspecifications&gt;\ &lt;/customwidget&gt;\ &lt;/customwidgets&gt;\ &lt;/ui&gt;"); } Q_EXPORT_PLUGIN2(dynamicpropertyextension, DynamicPropertyPlugin </code></pre> <h3>dynamicpropertyextension.h</h3> <pre><code> #ifndef DYNAMICPROPERTYEXTENSION_H #define DYNAMICPROPERTYEXTENSION_H #include &lt;QDesignerDynamicPropertySheetExtension&gt; #include &lt;QExtensionFactory&gt; class QAction; class QExtensionManager; class DynamicProperty; class DynamicPropertyExtension : public QObject, public QDesignerDynamicPropertySheetExtension { Q_OBJECT Q_INTERFACES(QDesignerDynamicPropertySheetExtension) public: DynamicPropertyExtension(DynamicPropertyExtenion *tic, QObject *parent); QAction *preferredEditAction() const; QList&lt;QAction *&gt; taskActions() const; private slots: void editState(); private: QAction *editStateAction; DynamicProperty *dynamicProperty; }; class DynamicPropertyExtensionFactory : public QExtensionFactory { Q_OBJECT public: DynamicPropertyExtensionFactory(QExtensionManager *parent = 0); protected: QObject *createExtension(QObject *object, const QString &amp;iid, QObject *parent) const; }; #endif </code></pre> <h3>dynamicpropertyextension.cpp</h3> <pre><code>#include &lt;QtDesigner&gt; #include &lt;QtGui&gt; #include "dynamicproperty.h" #include "dynamicpropertydialog.h" #include "dynamicpropertyextension.h" DynamicPropertyExtension::DynamicPropertyExtension(DynamicProperty *dp, QObject *parent) : QObject(parent) { dynamicProperty = dp; editStateAction = new QAction(tr("Edit State..."), this); connect(editStateAction, SIGNAL(triggered()), this, SLOT(editState())); } void DynamicPropertyExtension::editState() { DynamicPropertyDialog dialog(ticTacToe); dialog.exec(); } QAction *DynamicPropertyExtension::preferredEditAction() const { return editStateAction; } QList&lt;QAction *&gt; DynamicPropertyExtension::taskActions() const { QList&lt;QAction *&gt; list; list.append(editStateAction); return list; } DynamicPropertyExtensionFactory::DynamicPropertyExtensionFactory(QExtensionManager *parent) : QExtensionFactory(parent) { } QObject *DynamicPropertyExtensionFactory::createExtension(QObject *object, const QString &amp;iid, QObject *parent) const { if (iid != Q_TYPEID(QDesignerDynamicPropertySheetExtension)) return 0; if (DynamicProperty *dp = qobject_cast&lt;DynamicProperty*&gt;(object)) return new DynamicPropertyExtension(dp, parent); return 0; } </code></pre> <p>Since it is a designer plugin, you will need to assign the following configuration to qmake in the projet file:</p> <pre><code>CONFIG += designer plugin </code></pre>
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