How do you force authors or template stylists to force add a control

How do you force authors or template stylists to force add a control

Solution- Provides template authors the information that these parts are required for styling this control -more like a contract

[TemplatePart [Name=TextBlockPart, Type =typeof(TextBlock)))

public class MyControl : Control

{

private const string TextBlockPart as PART_TextBlock;

TextBlock textblock;

protected TextBlock Textßlock

get { return textblock;}
set
{
if (textßlock is null)

(

textblock.Textlnput-= new TextCompositionEventHendler(textblockTextlnput)

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