chartData.grabExcessHorizontalSpace = true;
chartData.grabExcessVerticalSpace = true;
chartViewer.setLayoutData(chartData);
// ImageViewer
imageViewer = new ImageViewer(parent, SWT.NONE);
GridData imageData = new GridData(300, 300);
imageData.verticalAlignment = GridData.BEGINNING;
imageData.horizontalSpan = 2;
imageData.grabExcessHorizontalSpace = true;