8 Answers, 1 is accepted
You may create a custom filtering control just as illustrated in our demos and this blog post as well. As for disabling the filtering for some of the columns, you may set the IsFilterable property of the column to "False" - this approach is demonstrated in the above-mentioned demo as well.
Do let me know in case you need any further assistance.
Maya
the Telerik team

I would gladly send you a sample project, but I would need slightly more details about your exact requirements - how exactly do you want to filter your data ? What will be the behavior that you expect ?
Maya
the Telerik team

Unfortunately, I am still not able to comprehend the way you want your filtering control to work. What will be the expected result when selecting 30 days for example - how this will be reflected on the Feb 08 2010 date. Do you expect to select dates in a particular time period depending on an initial value for example ?
Generally, the way our filtering architecture is working it as follows - it needs a Value, Member and LogicalOperator. Once an item has a property (corresponding to Member) equal/not equal (those values depend on the LogicalOperator) to the Value, this item will be filtered and displayed in the grid. In case you need a more complex filtering logic, you may use a CompositeFilteringDescriptor. If your specification may be satisfied and accomplished with the above mentioned logic, there will be no problem to create the desired filtering control. Is it possible to meet your requirements based on this architecture ?
Maya
the Telerik team

I am sending you a sample project illustrating a possible approach for accomplishing the required filtering functionality. Please take a look at it and let me know whether it corresponds to your requirements.
Maya
the Telerik team

Cool..Thanks!!!