Combobox having values but not showing text

Question

hi,

I'm using GWT-EXT combobox. My problem is when I render the combobox, it's having as many rows as it has values but all the rows are empty means text is not shown. Here's my code.

Combobox cb = new Combobox();

cb.setForceSelection(true);

cb.setMinChars(1);

cb.setWidth(200);

cb.setStore(store); // Store is perfectly loaded in combobox

cb.setDisplayField("ReportName");

cb.setMode(ComboBox.LOCAL);

cb.setTriggerAction(ALL);

cb.setEmptyText("--Select--");

cb.setLoadingText("Searching...");

cb.setTypeAhead(true);

cb.setSelectOnFocus(true);

All other code is working fine. I'm sure for one thing that this problem is related to one of the functions of Combobox.

Thanks in advance.