Disabling does not work in chrome and FireFox

Hi all,
I need enable and disable few text boxes , button and grid view cells based on check box true or false.
Disabling of text box inside a grid view is not working in Chrome and Firefox. The below code works fine in IE.
gvr.Cells[4].Enabled = false;   (gridview cell text box inside this cell)
imgbAdd.Enabled = false;   (button)
trButtons.Disabled = true;  (Radio button).
I have return this code in chkbx_CheckedChanged event. 
Any help.