When Dependant column in DatagridView then how to filter the data because privious selected items are disappear - windows

In my datagridview there are two dependent columns, one is category and the other is items. So I want to filter my item column list as per selected category.
But the problem is that when I change the category wise data to datasource of items combobox, previous selected items names disappear because previous items is not in current datasource.
So what is correct solution of such problem.

Filter columns with a Dataview: http://msdn.microsoft.com/en-us/library/system.data.dataview.aspx
Depending on input validation and what not, you can update the DataSource after an edit operation.

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Set the column's OptionsFilter.FilterPopupMode to CheckedList.
http://www.devexpress.com/Support/Center/p/Q250696.aspx

NotApplicable marker with display pattern

Ok, so I'm pretty new to Cocoa, especially Bindings, but here's what I'm trying to do. I've got a Core Data model consisting of two entities: Category and Item. Category has a to-many relationship to Item called children, and Item has a relationship to Category called parent. Item has two attributes that Category does not have: quantity and desiredQuantity. What I'd like to do is display the tree in an NSOutlineView with two columns. One column is bound to the name of either the Category or the Item. I want to the second column to display something along the lines of
2 of 5
for the Item rows and nothing at all for the Category rows. When I use a display pattern, the Category rows end up showing
of
I noticed that if I don't use a display pattern for the second column, and instead just bind its Value to either the quantity or the desiredQuantity, the Category rows show nothing; its only if I try to use the display pattern.
How can I make it display nothing for the Category rows and still use the display pattern? Or can I?
Edit:
I guess I didn't explain what the NotApplicable marker has to do with anything - Category does have properties for quantity and desiredQuantity, but they just return NSNotApplicableMarker.
This looks like a job for a custom NSFormatter or just a read-only NSString property called "paginationString" ...

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