c# - Why is my view not updating on a view model change? -


parent view model command method in possalesviewmodel
know might have broken concept of mvvm code below i'm new , improvement appreciated.

private void addproduct(productdto productdto) {     var ctx = (possalesdetailsviewmodel)((possalesdetailsview)tabitems[_selectedtabindex].content).datacontext;     ctx.productlines.add(new productline()     {         product = productdto.description,         quantity = 1,         producttradechannelid = productdto.producttradechannelid,         amount = productdto.amount     }); }

child view model possalesdetailsviewmodel
below collection reached view not being updated

public observablecollection<productline> productlines {     => _productlines;     set { set(ref _productlines, value); } }

here child view binding collection 

<datagrid x:name="producttypesdatagrid" itemssource="{binding productlines, mode=twoway}"         autogeneratecolumns="false" canusersortcolumns="true" canuseraddrows="false">     <datagrid.columns>         <materialdesign:materialdatagridtextcolumn isreadonly="true" binding="{binding product, mode=twoway}"                                                 header="product" width="auto" />         <materialdesign:materialdatagridtextcolumn isreadonly="true"                                                 binding="{binding quantity, mode=twoway}"                                                 header="quantity" width="auto" />         <materialdesign:materialdatagridtextcolumn isreadonly="true"                                                 binding="{binding amount, mode=twoway}"                                                 header="price" width="auto" />          <datagridtemplatecolumn width="auto">             <datagridtemplatecolumn.celltemplate>                 <datatemplate>                     <button content="delete"                             command="{binding datacontext.deletecommand,                              relativesource={relativesource ancestortype={x:type datagrid}}}"                             commandparameter="{binding}" />                 </datatemplate>             </datagridtemplatecolumn.celltemplate>         </datagridtemplatecolumn>     </datagrid.columns> </datagrid>

note

the child view model instance being created in constructor new instance each time (not mvvmlight way)

public possalesdetailsview() {     initializecomponent();     this.datacontext = new possalesdetailsviewmodel(); }

after debugging issue figured out issue was.

        <tabcontrol grid.row="0" grid.rowspan="2" grid.column="1"             itemssource="{binding tabitems}"             selectedindex="{binding selectedtabindex}">         <tabcontrol.itemtemplate>             <!-- header template-->             <datatemplate>                     <textblock                         text="{binding header}" />                                 </datatemplate>         </tabcontrol.itemtemplate>         <tabcontrol.contenttemplate>             <!-- body of tabitem template-->             <datatemplate>                 <local:possalesdetailsview/>//**problem here**             </datatemplate>         </tabcontrol.contenttemplate>     </tabcontrol>

the problem user control instance created on parent view load. when requested adding new user control inside tab item new instance created. , data not appearing. moved user control section.

                <datatemplate>                 <grid>                     <grid.rowdefinitions>                         <rowdefinition height="auto"/>                         <rowdefinition height="*"/>                     </grid.rowdefinitions>                     <textblock                         text="{binding header}" />                     <local:possalesdetailsview grid.row="1"/> // **here**                 </grid>             </datatemplate>         </tabcontrol.itemtemplate>

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