Refresh DataGrid When Observable Collection Changed

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.NET

Visual-Studio

WPF

C#5.0

, +

hello guys,
I am developing an application and for some needs i want to design DataGrid which Contains a Datagrid ComboBox Columns and when user select a member of the column list a new data bounded to the DataGrid Row Like (Unit Cost of the Selected Item ...etc).
the problem is when i change the Values of these fields in the ObservableCollections does not appear in the data grid Cell View even if i inserted a new Row and it is Fully Edited in the Observable Collection
this is my XML

<datagrid name="dgOrderItems">
                          Grid.Row="2" 
                          Margin="10,0,10,10"                          
                          CanUserAddRows="False"
                          CanUserDeleteRows="True"
                          CanUserResizeColumns="False"
                          CanUserReorderColumns="False"
                          CanUserResizeRows="False"
                          CanUserSortColumns="False"
                          AutoGenerateColumns="False"
                          SelectionMode="Single"
                          PreviewKeyDown="dgOrderItems_PreviewKeyDown"
                          BeginningEdit="dgOrderItems_BeginningEdit" >
                    <datagrid.resources>
                        <resourcedictionary>
                            <resourcedictionary.mergeddictionaries>
                                <resourcedictionary source="/PresentationFramework.Classic;component/themes/Classic.xaml" />
                            </resourcedictionary.mergeddictionaries>
                        </resourcedictionary>
                    </datagrid.resources>
                    <datagrid.columns>
                        <!--<datagridtemplatecolumn width="200" header="Item">
                            <datagridtemplatecolumn.celltemplate>
                                <datatemplate x:name="dt" xmlns:x="#unknown">
                                    <combobox x:name="Cmx">
                                              SelectionChanged="Cmx_SelectionChanged"
                                              Spy:ElementSpy.NameScopeSource="{StaticResource Espy}"
                                              ItemsSource="{Binding Source={StaticResource data}}"
                                              SelectedValuePath="ID" 
                                              DisplayMemberPath="Description" 
                                              SelectedValue="{Binding Path=ID, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
                                    </combobox>
                                </datatemplate>
                            </datagridtemplatecolumn.celltemplate>
                        </datagridtemplatecolumn>-->
                        <datagridcheckboxcolumn header="Recieved" width="Auto">
                                                IsReadOnly="True" 
                                                Binding="{Binding Path=ISRecieved, Mode=TwoWay}"
                                                ></datagridcheckboxcolumn>
                        <datagridcomboboxcolumn x:name="cmxitems" header="Item" width="*" xmlns:x="#unknown">
                                                DisplayMemberPath="Description" 
                                                SelectedValuePath="ID"
                                                SelectedValueBinding="{Binding Path=ItemID, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, NotifyOnSourceUpdated=True,  ValidatesOnDataErrors=True}">
                            <datagridcomboboxcolumn.editingelementstyle>
                                <Style TargetType="{x:Type ComboBox}">
                                    <setter property="BorderBrush" value="Transparent" />
                                    <setter property="IsEditable" value="True" />
                                    <setter property="IsSynchronizedWithCurrentItem" value="True" />
                                    <setter property="AllowDrop" value="True" />
                                    <setter property="IsDropDownOpen" value="true" />
                                    <setter property="IsTextSearchEnabled" value="True"></setter>
                                    <eventsetter event="SelectionChanged" handler="cmxitems_SelectionChanged"></eventsetter>
                                    <setter>
                                        <setter.property>
                                            ItemsPanel
                                        </setter.property>
                                        <setter.value>
                                            <itemspaneltemplate>
                                                <virtualizingstackpanel />
                                            </itemspaneltemplate>
                                        </setter.value>
                                    </setter>
                                    <Style.Triggers>
                                        <trigger property="IsHitTestVisible" value="True">
                                            <setter property="IsDropDownOpen" value="True" />
                                        </trigger>
                                    </Style.Triggers>
                                </Style>
                            </datagridcomboboxcolumn.editingelementstyle>
                        </datagridcomboboxcolumn>
                        <datagridcomboboxcolumn x:name="cmxGlAccounts" header="GL Account" width="*" displaymemberpath="Description" xmlns:x="#unknown">
                                                SelectedValuePath="ID" 
                                                SelectedValueBinding="{Binding Path=GLAccountInventoryID, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, NotifyOnSourceUpdated=True,  ValidatesOnDataErrors=True}">
                            <datagridcomboboxcolumn.editingelementstyle>
                                <Style TargetType="{x:Type ComboBox}">
                                    <setter property="BorderBrush" value="Transparent" />
                                    <setter property="IsEditable" value="True" />
                                    <setter property="IsSynchronizedWithCurrentItem" value="True" />
                                    <setter property="AllowDrop" value="True" />
                                    <setter property="IsDropDownOpen" value="true" />
                                    <setter property="IsTextSearchEnabled" value="True"></setter>
                                    <setter>
                                        <setter.property>
                                            ItemsPanel
                                        </setter.property>
                                        <setter.value>
                                            <itemspaneltemplate>
                                                <virtualizingstackpanel />
                                            </itemspaneltemplate>
                                        </setter.value>
                                    </setter>
                                    <Style.Triggers>
                                        <trigger property="IsHitTestVisible" value="True">
                                            <setter property="IsDropDownOpen" value="True" />
                                        </trigger>
                                    </Style.Triggers>
                                </Style>
                            </datagridcomboboxcolumn.editingelementstyle>
                        </datagridcomboboxcolumn>
                        <datagridtextcolumn header="Description" width="3*" binding="{Binding Path=Description, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, NotifyOnSourceUpdated=True,  ValidatesOnDataErrors=True}"></datagridtextcolumn>
                        <datagridtextcolumn header="Quantity" width="100" binding="{Binding Path=Quantity, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, NotifyOnSourceUpdated=True,  ValidatesOnDataErrors=True}">
                            <datagridtextcolumn.editingelementstyle>
                                <Style TargetType="{x:Type TextBox}">
                                    <eventsetter event="KeyDown" handler="TEXT_QuantityEntered"></eventsetter>
                                </Style>
                            </datagridtextcolumn.editingelementstyle>
                        </datagridtextcolumn>
                        <datagridtextcolumn header="Unit Price ($)">
                                            Width="100" 
                                            Binding="{Binding Path=UnitPrice, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, NotifyOnSourceUpdated=True,  ValidatesOnDataErrors=True}">
                            <datagridtextcolumn.editingelementstyle>
                                <Style TargetType="{x:Type TextBox}">
                                    <eventsetter event="KeyDown" handler="TEXT_UnitPriceEntered"></eventsetter>
                                </Style>
                            </datagridtextcolumn.editingelementstyle>
                        </datagridtextcolumn>
                        <datagridtextcolumn header="Amount($)" width="100" binding="{Binding Path=Amount, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, NotifyOnSourceUpdated=True,  ValidatesOnDataErrors=True}" isreadonly="True"></datagridtextcolumn>
                    </datagrid.columns>
                    <datagrid.contextmenu>
                        <contextmenu>
                            <menuitem header="Add New Item" name="NewOrderItem" click="NewOrderItem_Click"></menuitem>
                            <menuitem header="Delete Selected Item" name="DeleteOrderItem" click="DeleteOrderItem_Click"></menuitem>
                        </contextmenu>
                    </datagrid.contextmenu>
                </datagrid>

and this is MY Source Code

 void ReFillOrderItems()
        {
            if (this.ICurrentOrderID != -1)
            {
                this.orderitems = ClsPurchaseController.SelectAllOrderItems_ByOrderIDList(this.ICurrentOrderID);
            }
            else
            {
                this.orderitems = new List<orderitem>();
            }
            this.dgOrderItems.ItemsSource = this.orderitems;
        } 

private void cmxitems_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            try
            {
                ComboBox cmx = sender as ComboBox;
                this.RefillItemDefaults(Convert.ToInt32((int)cmx.SelectedValue));
            }
            catch
            {
                
            }
        }