Success! Looks like we've fixed this one. According to our records the fix was applied for
Sencha Premium Member
Checkbox on column name in Grid's column menu not displayed in IE7
Attached the screenshot, checkbox near column name is not displayed in IE 7, but its showing correctly from IE8 version.,
Thanks for the report and screenshot. This seems to be a problem with all menu items in IE7. I've filed a bug against the team and will update here with any changes we make.
I've committed a fix for this bug to SVN as r2674.
Ext GWT Premium Member
The fix for this bug has been included in the public release of Sencha GXT 3.0.0. You should now see the fix included in the GXT Explorer demo. I've also marked the linked related thread as fixed.