Composite leftContainer = formFactory.createComposite(control);
leftContainer.setLayoutData(LayoutConstants.FILL());
leftContainer.setLayout(LayoutConstants.LAYOUT(1, false));
// leftContainer.setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_BLUE));
RootElement leftRoot = new RootElement(formFactory, leftContainer);
Composite leftContainer = formFactory.createComposite(control);
leftContainer.setLayoutData(LayoutConstants.FILL());
leftContainer.setLayout(LayoutConstants.LAYOUT(1, false));
// leftContainer.setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_BLUE));
RootElement leftRoot = new RootElement(formFactory, leftContainer);