DockWidget with Direct3D Widget and expanding problem

[NIteLordz]

I have the following setup within Qt

class Editor : public QMainWindow {
...
};

class Editor : public QMainWindow {
...
};

To copy to clipboard, switch view to plain text mode 

Within this Editor class, i create a SceneWidget which is defined as

class EditorSceneWindow : public QDockWidget {
...
};

class EditorSceneWindow : public QDockWidget {
...
};

To copy to clipboard, switch view to plain text mode 

Within the EditorSceneWindow i have a custom Direct3D widget defined as

class D3DRenderWidget : public QWidget {
...
};

class D3DRenderWidget : public QWidget {
...
};

To copy to clipboard, switch view to plain text mode 

I create an EditorSceneWindow and set it's parent to MainWindow. In EditorSceneWindow, i create a D3DRenderWidget that initializes my engine.

My problem is that when the application starts up, the size of my Direct3DWidget is 100x30 (Toolbar dimensions of the DockWidget. I know i can set the minimum width/height, however, i want the Direct3DWidget to fill the entire DockWidget. I have tried setting numerous different combos of the QSizePolicy for the Direct3DWidget, as it is the child of the SceneWindow DockWidget.

Thanks in advance.