マップからeditingToolBarを削除できません。このコードが機能しない理由がわかりません:
var editingToolBar = new OpenLayers.Control.Panel({
    displayClass: 'customEditingToolbar',
    allowDepress: true
}); 
var draw = new OpenLayers.Control.DrawFeature(
    newShape, OpenLayers.Handler.Polygon,
    {
       title: "Draw Feature",
       displayClass: "olControlDrawFeaturePolygon",
       multi: true
    }
);
var edit = new OpenLayers.Control.ModifyFeature(newShape, {
    title: "Modify Feature",
    displayClass: "olControlModifyFeature"
});
editingToolBar.addControls([edit, draw]);
map.addControl(editingToolBar);
function stopEditing(){
    map.removeControl(editingToolBar);
}
デバッグお疲れ様です!