c# - Wpf Nesting Databound TabControls -

i'm pretty new wpf , i'm trying series of nested tabcontrols in order filter data, nested tabs never seem want appear.

<tabcontrol itemssource="{binding years}" selecteditem="{binding selectedyear, updatesourcetrigger=propertychanged}">     <tabcontrol.contenttemplate>         <datatemplate>             <tabcontrol itemssource="{binding customers}" selecteditem="{binding selectedcustomer, updatesourcetrigger=propertychanged}">                  <tabcontrol.contenttemplate>                       <datatemplate>                            <!-- data filtered year , customer here -->                      </datatemplate>                  </tabcontrol.contenttemplate>             </tabcontrol>         </datatemplate>     </tabcontrol.contenttemplate> </tabcontrol> 

if use defined tabitems without databinding within first datatemplate, show no problem. there trick getting nested databound tab controls work? doing in dumb way in general?

edit: data in viewmodel meant filter observablecollection of forecast objects:

public observablecollection<forecast> forecastsnational     {         { return _forecastsnational ?? (_forecastsnational = new observablecollection<forecast>()); }         set { set(() => forecastsnational, ref _forecastsnational, value); }     } 

relevant properties being: datetime forecastdate, string customername, int quantity, decimal amount

currently, "years" , "customers" collections being populated selecting distinct values forecastsnational collection:

forecastsnational.select(x => x.customer).orderby(x => x).distinct() 

my plan use icollectionview on collection , apply filters using selectedyear , selectedcustomer values:

forecastsnationalcollectionview.filter =             m => ((forecast)m).year == int.parse(selectedyear) && ((forecast)m).customer == selectednationalcustomer;