$grandchildbutton 'is_active' fix
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If you're like me and have edited your top menu or have created a site menu which contains second or third layer sub-buttons for the dropdowns, you may have noticed a large number of undefined is_active in your Error Log.
This is because the template_menu() function checks for is_active for grandchildren, when it is impossible for a grandchild to be active (as it is not seen from the default menu itself).
The following modification is a fix for this problem. This will repair the issue only for the default theme and any other curve-based themes (make sure you select the option to install to custom themes!)
Dream Portal Team