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import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.action.Separator;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.viewers.ISelectionChangedListener;
Composite parent= new Composite(ancestor, SWT.NONE);
GridLayout layout= new GridLayout();
layout.numColumns= 2;
layout.marginTop= convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_MARGIN);
layout.marginWidth= convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_MARGIN);
parent.setLayout(layout);
parent.setLayoutData(new GridData(GridData.FILL_BOTH));