IPropertyControl control = PropertyControlClassFactory.Instance.
CreatePropertyControl(property);
if (control != null)
{
control.PropertyData = myPage.Property["YourProperty"];
control.Properties = myPage.Property;
control.RenderType = RenderType.Edit;
myPanel.Controls.Add((Control) control);
}

It is also possible to put your PropertyDataControl subclass in your aspx/ascx file as a web control and assign the values above.

Note that the XHtmlEditor assumes a lot about it's sorrundings. Like that is is placed on a subclass of PageBase, etc.