not able select month or year in datefield

Hi..

I am using Extjs 4.2.3 version in my application.

In this am using datefield.

In this datefield am not able select the month, year.

I am attaching the iamge here.

In that if i select the month or year it disappearing and not able to select the month, year in the datefield.

Here is my code for datefield..

{

xtype: 'datefield',

fieldLabel: 'Title1',

labelAlign:'right',

name: 'title',

columnWidth:.3

}

Help me in this....

Thanks

Kamalakar Reddy

not able select month or year in datefield