C# wpf dataGrid comboBox - why is a type assigned when an option is selected and when data is entered, they are not written?

Question

C++ / C#

Hello!
I am new to c# wpf. I am writing my first application and asking for help.
I made a client application that accesses the database and displays its contents in a dataGrid for further editing.

At the same time, 2 problems arose:
1) When a status is selected (in a comboBox), in addition to the status itself, the cell also displays the type:
"System.Windows.Controls.ComboBoxItem: To work" instead of "To work".
Description of ComboBox: (it's in resources)

<DataTemplate x:Key="StatusTemplate" >
            <TextBlock Text="{Binding Path=status, ConverterParameter=DefaultToString}"/>
</DataTemplate>
<DataTemplate x:Key="EditingStatusTemplate">
            <ComboBox SelectedItem="{Binding Path=status, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" DropDownOpened="ComboBox_DropDownOpened">
                <ComboBoxItem Content="Черновик" IsEnabled="True"/>
                <ComboBoxItem Content="В работу" IsEnabled="True"/>
                <ComboBoxItem Content="В работе" IsEnabled="True"/>
                <ComboBoxItem Content="Остановлен" IsEnabled="True"/>
                <ComboBoxItem Content="Завершен" IsEnabled="True"/>
                <ComboBoxItem Content="Завершен по N2" IsEnabled="True"/>
            </ComboBox>
</DataTemplate>

in DataGrid.Columns

<DataGridTemplateColumn Header="Статус" CanUserResize="False" CellTemplate="{StaticResource StatusTemplate}" CellEditingTemplate="{StaticResource EditingStatusTemplate}"/>

2) when entering data into columns of type DataGridTextColumn and DataGridComboBoxColumn in dataGrid'e in the line in which the data was added, it is not displayed during debugging. And I want to check if all the cells in the row are filled and if so, then allow editing the status.
Column description example:

<DataGridTextColumn Binding="{Binding Path=progress}" ClipboardContentBinding="{x:Null}" Header="Прогресс" CanUserResize="False"/>

I tried to check the contents of the dataGrid in the handler using the debugger:

private void dataGrid_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
{
            DataGrid dg = dataGrid;
}

And in the handler:

private void dataGrid_BeginningEdit(object sender, DataGridBeginningEditEventArgs e)

I check whether all other cells are filled except for the status, and if so, I allow it to be edited.
Thanks in advance!