jQuery Grid Plugin - jqGrid

I'm not able to change the columns width in the latest jqGrid version (4.4.1).

In the 3.8.2 version I used this code to change columns width (and it works well):

grid options: shrinkToFit = true;

I put the following code in the loadComplete section.

First of all I changed the columns width: $("#gridId").jqGrid('setColProp',"colname",{width:new_width});

and then I changed the grid width $("#gridId").jqGrid('setGridWidth', newGridWidth);

and the grid was properly rendered.

I already tried to use the 4.3.2 modified release: JQGrid: Resize Grid Width After Column Resized
but with no success.

Any suggest?

Thank you