final ForwardUndoCompositeOperation compositeMoveOperation = new ForwardUndoCompositeOperation("Composite move");
		ContentPolicy<Node> childPolicy = part.<ContentPolicy<Node>> getAdapter(ContentPolicy.class);
		childPolicy.init();
		childPolicy.removeFromParent();
		
		ContentPolicy<Node> newPolicy = newParent.<ContentPolicy<Node>> getAdapter(ContentPolicy.class);
		newPolicy.init();
		newPolicy.addContentChild(part.getContent(), 0);
				
		compositeMoveOperation.add(childPolicy.commit());
		compositeMoveOperation.add(newPolicy.commit());
		part.getRoot().getViewer().getDomain().execute(compositeMoveOperation);

package com.itemis.sample.ui.builder.fx;

import java.util.Collections;
import java.util.List;

import org.eclipse.gef.common.collections.CollectionUtils;
import org.eclipse.gef.mvc.fx.parts.AbstractFXContentPart;
import org.eclipse.gef.mvc.viewer.IViewer;

import com.google.common.collect.SetMultimap;

import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.control.Button;
import javafx.scene.input.KeyEvent;

public class ButtonPart extends AbstractFXContentPart<Group> {

        private Button button;

        @Override
        protected Group createVisual() {
                // create group
                Group group = new Group();
                group.setPickOnBounds(true);
                // create button
                button = new Button();
                button.setOnAction((ae) -> {
                        double sx = button.getScaleX() * 1.125;
                        button.setScaleX(sx);
                        button.setScaleY(sx);
                });
                // put button into group
                group.getChildren().add(button);
                return group;
        }

        @Override
        protected SetMultimap<? extends Object, String> doGetContentAnchorages() {
                return CollectionUtils.emptySetMultimap();
        }

        @Override
        protected List<? extends Object> doGetContentChildren() {
                return Collections.emptyList();
        }

        @Override
        protected void doRefreshVisual(Group visual) {
                button.setText(getContent().toString());
        }

        @Override
        protected void register(IViewer<Node> viewer) {
                super.register(viewer);
                viewer.getRootPart().getVisual().getScene().addEventFilter(KeyEvent.ANY, (ke) -> {
                        button.setMouseTransparent(ke.isShiftDown());
                });
        }

}