Custom controls the background

 public static readonly DependencyProperty SelectItemProperty=DependencyProperty. Register (" SelectGridItem typeof (OutboundOrder), typeof (Salesdatagrid)); 
Public OutboundOrder SelectGridItem 
{
The get 
{
Return (OutboundOrder) enclosing GetValue (SelectItemProperty); 
} 
Set 
{
Enclosing SetValue (SelectItemProperty, value); 
} 
} 




Private void Grid_OnSelectedCellsChanged (object sender, SelectedCellsChangedEventArgs e) 
{
SelectGridItem=Grid. SelectedItem as OutboundOrder; 
} 

Mainwindow calls

 & lt; Border Grid. The Column="0" & gt; 
 

Now is SelectGridItem has value, the viewmodel unable to get to the value

 private OutboundOrder _selectSaleItem; 

Public OutboundOrder SelectSaleItem 
{
The get {return _selectSaleItem; } 
Set 
{
_selectSaleItem=value; 
RaisePropertyChanged (()=& gt; SelectSaleItem); 
} 
} 

Is this what to make of it, or I where binding wrong