//IEditorSite editorSite = editorPart.getEditorSite();
WorkbenchPage wPage = (WorkbenchPage)page;
// editorPresentation
EditorAreaHelper editorAreaHelper = wPage.getEditorPresentation();
EditorSashContainer editorSashContainer = (EditorSashContainer)editorAreaHelper.getLayoutPart();
LayoutTree layoutTree = editorSashContainer.getLayoutTree();
Composite parent = editorSashContainer.getParent();