Microsoft.Phone.Controls.PhoneTextBox.OnApplyTemplate C# (CSharp) Method

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            if (_textBox != null)
            {
                _textBox.TextChanged -= OnTextChanged;
            }

            if (ActionIconBorder != null)
            {
                ActionIconBorder.MouseLeftButtonDown -= OnActionIconTapped;
            }

            _rootGrid = GetTemplateChild(RootGridName) as Grid;
            _textBox = GetTemplateChild(TextBoxName) as TextBox;
            
            // Getting the foreground color to save for later.
            _foregroundBrushEdit = Foreground;

            // Getting template children for the hint text.
            _hintContent = GetTemplateChild(HintContentName) as ContentControl;
            _hintBorder = GetTemplateChild(HintBorderName) as Border;

            if (_hintContent != null)
            {
                UpdateHintVisibility();
            }
            
            // Getting template children for the length indicator.
            _lengthIndicator = GetTemplateChild(LengthIndicatorName) as TextBlock;
            
            // Getting template child for the action icon
            ActionIconBorder = GetTemplateChild(ActionIconBorderName) as Border;

            if (_rootGrid != null && _lengthIndicator != null)
            {
                UpdateLengthIndicatorVisibility();
            }

            if (_textBox != null)
            {
                _textBox.TextChanged += OnTextChanged;
            }

            if (ActionIconBorder != null)
            {
                ActionIconBorder.MouseLeftButtonDown += OnActionIconTapped;
                UpdateActionIconVisibility(); // Add back the padding if needed.
            }

            
            // Get template child for the action icon measurement text block.
            _measurementTextBlock = GetTemplateChild(MeasurementTextBlockName) as TextBlock;
        }