scroll in grid borderlayout

<borderlayout id="bd">

			<center>

				<listbox id="lb" vflex="true" hflex="true"
					model="@{controlador.getListDispositivo}" mold="paging"
					pageSize="10" selectedItem="@{controlador.dispositivo}">
                                              .....................
				</listbox>
			</center>
			<south height="59.9%" splittable="true">


				<tabbox id="tb" height="100%" width="100%">
					<tabs id="tabs">
			                   ..............  
                                       </tabs>
					<tabpanels style="overflow:auto">
						<tabpanel>
							
							<grid id="grEditar"  style="overflow:auto" >
								<rows>
									...	
							               //many columns
								</rows>
							</grid>


						</tabpanel>
						

					</tabpanels>
				</tabbox>


			</south>
		</borderlayout>