[Users] changing grids in a tabpanel: grids only displayed once

[Robert Buckley]

Hi,

I have managed to set up a viewport containing 3 mapPanels which are contained 
in a tab panel.

With the code below I can start the application and the grids are loaded 
according to which tab is activated. The problem is that I can only do it once! 

If I change from from the first tab to the second tab....and then back to the 
first tab, the grid in is not activated!?!?

I´m sure there is a simple explanation...i hope. 
Can anyone see it?

The app is here...
http://maps.zgb.de:8080/geoserver/www/testing/wea_tabs.html


        var centerTabPanel = new Ext.TabPanel({
                    id:'centerTabPanel',
                    region:'center',
                    width: 800, 
                    activeTab: 0,
                    items:[mapPanel_wea, mapPanel_biogas, mapPanel_wasser]
                    });
                    
                    centerTabPanel.items.each(function(tab){
                    
                    tab.on('activate',function(panel){
                            if
                             (panel.id == 'WEA') {
                        //    Ext.Msg.alert('Panel', panel.id + '" tab?');
                            gridContainer.remove(grid_wasser);
                            gridContainer.remove(grid_biogas);
                            gridContainer.add(grid_wea);
                            gridContainer.doLayout();
                            }
                            else
                            if (panel.id == 'Biogas') {
                        //    Ext.Msg.alert('Panel', panel.id + '" tab?');
                            gridContainer.remove(grid_wea);
                            gridContainer.remove(grid_wasser);
                            gridContainer.add(grid_biogas);
                            gridContainer.doLayout();
                            }
                            else
                            if (panel.id == 'Wasserkraft') {
                        //    Ext.Msg.alert('Panel', panel.id + '" tab?');
                            gridContainer.remove(grid_wea);
                            gridContainer.remove(grid_biogas);
                            gridContainer.add(grid_wasser);
                            gridContainer.doLayout();
                            }
                    });
        
                });


Thanks for any help,

Robert
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