Creating property for wpf user control with datagrid

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WPF

Hai

I have a user control with a datagrid called IGrid. I want to add GridViewColumnCollection poperty for it.

From Google i got piece of code which is working

public class DataGridNumericColumn : DataGridTextColumn
        {
            protected override object PrepareCellForEdit(System.Windows.FrameworkElement editingElement, System.Windows.RoutedEventArgs editingEventArgs)
            {
                TextBox edit = editingElement as TextBox;
                edit.PreviewTextInput += OnPreviewTextInput;

                return base.PrepareCellForEdit(editingElement, editingEventArgs);
            }
            void OnPreviewTextInput(object sender, System.Windows.Input.TextCompositionEventArgs e)
            {
                try
                {
                    Convert.ToInt32(e.Text);
                }
                catch
                {
                   e.Handled = true;
                }
            }
        }

private Collection field = new Collection();
        [Category("Data")]
        [Description("Column Creation")]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        public Collection Columns
        {
            get { return field; }
        }

My question is how to add a new type (DataGridNumericColumn )in the collection

using the above code.

Thanks.

What I have tried:

In a user control I added a datagrid, and the above code, I can get all datagridcollections in <othertypes> of visual tree.