Composite rightComposite = new Composite(mainComposite, SWT.NONE);
rightComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
rightComposite.setLayout(new GridLayout(1, false));
propertiesComposite = new Composite(rightComposite, SWT.NONE);
propertiesStackLayout = new StackLayout();
propertiesComposite.setLayout(propertiesStackLayout);
GridData propertiesCompositeGD = new GridData(SWT.FILL, SWT.FILL, true, true);
// propertiesCompositeGD.horizontalSpan = 2;
propertiesComposite.setLayoutData(propertiesCompositeGD);