Method onDoModal

UnitTests/UnitTest_GraphView/OpenSaveFileDialog.cpp:199–209

	}

	void OpenSaveFileDialog::onDoModal()
	{
		update();

		MyGUI::IntSize windowSize = mMainWidget->getSize();
		MyGUI::IntSize parentSize = mMainWidget->getParentSize();

		mMainWidget->setPosition(
			(parentSize.width - windowSize.width) / 2,
			(parentSize.height - windowSize.height) / 2);
	}

	void OpenSaveFileDialog::onEndModal()
	{