var mainWindow=new Ext.Window({width: 600,height: 400,title:'newwindow'});
var mainPanel=new Ext.Panel({
	layout:'border',
	height: 700,
	items:[
	{region:'west',
		collapsible:true,
		title: 'Lagen',
		split:true,
		width:200},
	{region:'center'},
	{region:'east',
		collapsible:true,
		title: 'Legenda',
		split:true,
		width:200},
	{region:'south',
		collapsible:true,
		title: 'Info',
		split:true,
		height:200}
	]
});
mainWindow.add(mainPanel);
mainWindow.show();
var centerPanel=new Ext.Panel({id:'kaartpanel',title:'kaart',bodyStyle:'background-color:red',html:'hallo'});
mainPanel.layout.center.panel.add(centerPanel);
Ext.getCmp('kaartpanel').update('hallo daar');
mainPanel.layout.center.panel.doLayout();