Set default value on a custom property

I have created a longstring custom property that gives me a XHTML editor. So far so good but I need help with two things.

First, I would like to fill the property with a default value. I've looked at a couple of blog post about this but can't seem to get it right.

Second, I would want to render the custom property as a regular textbox that can hold a large string.

public class CustomerTypeBoxControl :
    EPiServer.Web.PropertyControls.PropertyLongStringControl
{
    protected override void SetupEditControls()
    {
        base.SetupEditControls();                            
    }

    public CustomerTypeBox CustomerTypeBox
    {
        get
        {
            return PropertyData as CustomerTypeBox;
        }
    }
}

[Serializable]
[PageDefinitionTypePlugIn]
public class CustomerTypeBox : EPiServer.Core.PropertyLongString
{
    public override IPropertyControl CreatePro开发者_Go百科pertyControl()
    {
        return new CustomerTypeBoxControl();
    }
}

Don't know if it is steel relevant but here is the solution:

TextBox _textBox;
protected override void SetupEditControls()
{
    base.SetupEditControls();

    _textBox = (TextBox)EditControl;
    var value = CustomerTypeBox.Value ?? string.Empty;
    if (String.IsNullOrEmpty(value.ToString()))
    {
        _textBox.Text = "Default text";
    }
    else
    {
        _textBox.Text = value.ToString();
    }
    if (_textBox != null) EditControl.Parent.Controls.Add(_textBox);
}

public override void ApplyEditChanges()
{
    var customerTypeBoxValue = _textBox.Text;

    if (customerTypeBoxValue != null)
    {
        SetValue(customerTypeBoxValue);
    }
}

Default value for property is also possible to set in admin mode.