SharePoint 2010 - Hide list item based on percentage of another item within the same list

I'm looking for a solution to hide, or disable the editing of a list item based on another item within the same list.
Example:
A list with the following:
SP1 - Project title
SP1.1 - Task 1
SP1.2 - Task 2
SP1.3 - Task 3.

SP1.2 and 1.3 should be disabled or grayed out until Task 1 is completed with 100%.
When 1.1 is completed, 1.2 can be edited, and 1.3 diabled or grayed out.
I'm thinking of workflows or some sourt of C# solution.

Any suggestion will be greatly appreciated.
Thank you,
LVL 1
kixelsyDAsked:
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RobOwner (Aidellio)Commented:
It may just be easier to add a JavaScript solution to your page with your logic rather than changing the structure of the page. Are you using a particular framework?
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kixelsyDAuthor Commented:
Hi Tagit,
The data is in a custom list with no real customization. Some of the views are in a gnatt and Calender view.  The site is using .net 3.5.
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RobOwner (Aidellio)Commented:
If that's the case then you'll need to modify the sharepoint controls... out of my depth here, sorry.
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kixelsyDAuthor Commented:
Solution:
I figured it out with using workflows and views. I added a combo column called "active". I added a workflow that would update the column when the previous entree was completed. In the workflow it would look for the name of the entree and if there is a date in the "complete" date, it would look up the name in the other list items that had that name and an "inactive" setting. It then would turn that item to "active". To view the correct active items, I created a view that would only view the "active" entrees.".
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kixelsyDAuthor Commented:
It's not pretty, but it works
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