<action

               class="org.eclipse.compare.CompareWithOtherResourceAction"

               enablesFor="1"

               id="compareWithOtherResource"

               label="%CompareWithOtherResource.label"

               menubarPath="compareWithMenu/compareWithGroup"

               tooltip="%CompareWithOtherResourceAction.tooltip">

         </action>

CompareWithOtherResource.label= &Other Resource

CompareWithOtherResource.tooltip= Open the 'Compare With' Dialog

package org.eclipse.compare;

import org.eclipse.jface.action.IAction;

import org.eclipse.jface.viewers.ISelection;

import org.eclipse.swt.widgets.Shell;

import org.eclipse.ui.IObjectActionDelegate;

import org.eclipse.ui.IWorkbenchPart;

import org.eclipse.ui.PlatformUI;

public class CompareWithOtherResourceAction implements IObjectActionDelegate {

	Shell shell;

	CompareWithOtherResourceDialog dialog;

	public CompareWithOtherResourceAction() {

		shell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell();

	}

	public void setActivePart(IAction action, IWorkbenchPart targetPart) {

		// TODO Auto-generated method stub

	}

	public void run(IAction action) {

		dialog = new CompareWithOtherResourceDialog(shell);

		dialog.open();

	}

	public void selectionChanged(IAction action, ISelection selection) {

		// TODO Auto-generated method stub

	}

}

package org.eclipse.compare;

import org.eclipse.jface.dialogs.Dialog;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.events.SelectionListener;

import org.eclipse.swt.layout.FillLayout;

import org.eclipse.swt.layout.GridData;

import org.eclipse.swt.layout.GridLayout;

import org.eclipse.swt.widgets.Button;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Control;

import org.eclipse.swt.widgets.Group;

import org.eclipse.swt.widgets.Label;

import org.eclipse.swt.widgets.Shell;

import org.eclipse.swt.widgets.Text;

public class CompareWithOtherResourceDialog extends Dialog {

	private class InternalGroup {

		Group group;

		Composite parent;

		public InternalGroup(Composite parent) {

			createContents(parent);

		}

		public void createContents(Composite parent) {

			GridLayout layout = new GridLayout();

			layout.numColumns = 3;

			group = new Group(parent, SWT.NONE);

			group.setLayout(layout);

			GridData gridData = new GridData();

			gridData.grabExcessHorizontalSpace = true;

			gridData.grabExcessVerticalSpace = true;

			group.setLayoutData(gridData);

			Label fileLabel = new Label(group, SWT.NONE);

			fileLabel.setText("File: ");

			Text ancestor = new Text(group, SWT.SINGLE | SWT.BORDER);

			GridData textData = new GridData();

			//textData.horizontalSpan = 2;

			textData.grabExcessHorizontalSpace = true;

			textData.horizontalAlignment = SWT.FILL;

			ancestor.setLayoutData(textData);

			createButtons(group);

		}

		public Composite createButtons(Composite parent) {

			Composite buttons = new Composite(parent, SWT.FILL);

			FillLayout buttonsLayout = new FillLayout();

			buttonsLayout.type = SWT.VERTICAL;

			buttons.setLayout(buttonsLayout);

			Button openTypeButton = new Button(buttons, SWT.PUSH);

			openTypeButton.setText("Open Type...");

			openTypeButton.addSelectionListener(new SelectionListener() {

				public void widgetDefaultSelected(SelectionEvent e) {

				}

				public void widgetSelected(SelectionEvent e) {

				}

			});

			Button openFileButton = new Button(buttons, SWT.PUSH);

			openFileButton.setText("Open File...");

			Button openResourceButton = new Button(buttons, SWT.PUSH);

			openResourceButton.setText("Open Resource...");

			return buttons;

		}

		public void setText(String text) {

			group.setText(text);

		}

		public void setLayoutData(GridData layoutData) {

			group.setLayoutData(layoutData);

		}

	}

	Button okButton, cancelButton;

	protected CompareWithOtherResourceDialog(Shell shell) {

		super(shell);

		setShellStyle(SWT.MODELESS | SWT.TITLE);

	}

	protected Control createDialogArea(Composite parent) {

		Composite mainPanel = new Composite(parent, SWT.NULL);

		GridLayout layout = new GridLayout();

		layout.numColumns = 2;

		layout.makeColumnsEqualWidth = true;

		mainPanel.setLayout(layout);

		mainPanel.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

		InternalGroup ancestorPanel = new InternalGroup(mainPanel);

		ancestorPanel.setText("Ancestor");

		GridData ancestorGD = new GridData(SWT.FILL, SWT.FILL, true, true);

		ancestorGD.horizontalSpan = 2;

		ancestorPanel.setLayoutData(ancestorGD);

		InternalGroup leftPanel = new InternalGroup(mainPanel);

		leftPanel.setText("Left panel");

		GridData leftGD = new GridData(SWT.FILL, SWT.FILL, true, true);

		leftPanel.setLayoutData(leftGD);

		InternalGroup rightPanel = new InternalGroup(mainPanel);

		rightPanel.setText("Right panel");

		GridData rightGD = new GridData(SWT.FILL, SWT.FILL, true, true);

		rightPanel.setLayoutData(rightGD);

		return mainPanel;

	}

}