how to select an item value from disabled ext combobox?

[masudcseku]

Currently I was working with ext combobox. And I found that when combo box is disabled the following code for selecting the selected item is not working.
Here is the code

 this._objProduct.MATURITY_RATING = cmbMaturityRating.SelectedItem.Value;

But this works when combo box is enabled. Please help how to bypass this problem and get the selected value which was selected before disabling.
thx in advance