Grid Filter Issue

Hi, am facing problem while filtering the column value as mentioned in below screenshot i.e not able to see the symbols (<, >, =) which is marked in red colour.

gridfilter.png

Actually I have followed the same Grid Filter example given in extjs 4.2 version. Screenshot is attached below which is working. i.e I need the symbols while filtering the column as given below.

gridfitercompare.png

Please provide the solution for the same

Thanks in advance.

Grid Filter Issue