data binding - WPF databound Combobox -


i need create usercontrol behaves combobox. instances of combobox databound collection @ runtime. (i.e collection of strings, keep question minimal possible).

however, combobox needs have "exclusion list", holds entries not shown in dropdown list of combobox, in case appear in databound collection. filtered out.

up till point have managed create control fullfills requirements.

  1. however, screens use these comboboxes used display objects might have been created before entries manually added "exclusion list" described above. in these cases still need have comboboxes show value, though in exception list. however, in case user tries change value, should not appear in dropdown.

  2. apart exclusion list, need filter remaining elements based on simple rule. simplicity, let's assume don't want entries string length of 7.

i'm new wpf. have tried on , over, , see no starting point implement these last 2 requirements. i'm hoping here can point me in right direction way implement (1) , (2). have access infragistics 2013 in case controls closer solution.


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