Sometimes Ext.EventObject is null

[zouyu]

We had a strange problem, sometimes the application works O.K., sometimes it says Ext.EventObject is null in ext-all.js in object Ext.EventManager.

I thought it was caused by multiple onDocumentReady listeners so I moved all the initialization code into a single javascript function but the problem still persists. There are EditorGrid, DateField and TabPanel controls from EXTJS used on the page.

Does anyone have any clue? Thanks!

[evant]

You need to post your code.

[zouyu]

I thought of code, but it is very lengthy. Let me make it short at first.

We defined a init function like this,
var SGSExtGrid1_Example = {
init : function(){
...

SGSExtGrid1_dataGrid = new Ext.grid.EditorGrid('SGSExtGrid1', {
ds: SGSExtGrid1_dataStore,
cm: colModel,
clicksToEdit: 1,
selModel: new Ext.grid.CellSelectionModel()
});
...
SGSExtGrid1_dataGrid.render();

try{
furtherInit();
}catch(e_onDataReady){}

}
Ext.onReady(SGSExtGrid1_Example.init, SGSExtGrid1_Example);

And here is a part of the furtherInit function which is used to add tab pages,
function furtherInit()
{
initTabPages();
}
function initTabPages(){
initializeDateHandler();

// basic tabs 1, built from existing content
var tabs = new Ext.TabPanel('south');

var tb1=tabs.addTab('Conclusions', "Conclusions");
tb1.on('activate', function(){
try{TabClick(this.id);$("txtActiveTab").value=this.id;}catch(e){}
});

var tb2=tabs.addTab('Products', "Products");
tb2.on('activate', function(){
try{TabClick(this.id);$("txtActiveTab").value=this.id;}catch(e){}
});
var tb3= tabs.addTab('Loadings', "Loadings");
tb3.on('activate', function(){
try{TabClick(this.id);$("txtActiveTab").value=this.id;}catch(e){}
});
var tb4=tabs.addTab('Special', "Special");
tb4.on('activate', function(){
try{TabClick(this.id);$("txtActiveTab").value=this.id;}catch(e){}
});
//tabs.activate($F("txtActiveTab"));
tabs.activate('Products');

}

P.S. This is a ASP.Net web page