How to add a new row to Winforms DataGridView in my custom column

Question

I have made a custom column for my DataGridView which is used in editable mode. While I am entering data in every column, the dataGrid automatically adds a new row as follows :

But in my custom column it does not happen.

which part of the custom column is responsible for adding new rows and how should I do that.

EDIT : I implemented three classes for my custom column :

public class DataGridViewLookupColumn : DataGridViewColumn {...}
public class DataGridViewLookupCell : DataGridViewTextBoxCell{...}
public class DataGridLookupControl : LookupControl, IDataGridViewEditingControl{...}

EDIT : I am filling my DatagridView using a binding source.

this.dataGrid.DataSource = BindingSource;
BindingSource.DataSource = model;
model=await this.EntityService.AdvancedSearchAsync(...);

above codes are gathered from three diffrent points in application to show structure of my data and application.

Thanks in advance for your time and your consideration of course.

Answer 1

I finally figured out how to solve it. It's just

DataGridView.NotifyCurrentCellDirty(true);

I added this code to my change event and my problem solved.