predefine grid filter

Hi, I’m wondering if this is possible:
I have grid, and I’m adding filter line like this:

grid.attachHeader("#text_filter,#text_filter");

But now I need to predefine something in the grid filter line…
e.g. in first column filter textbox I want to have ‘hello’… is this possible?

You may try to use the following:

   mygrid.getFilterElement(column_index).value="hello"