Topic: Question on AdornedElementPlaceholder
It is necessary to add it to TextBox. Alas, there not TextBox, and WatermarkTextBox which in itself contains TextBox and still TextBlock for this most water mark Found the description how to make for TextBox. https://msdn.microsoft.com/en-us/library/ms753962 (v=vs.110).aspx c binding and Validation. ErrorTemplate. And as at me TextBox enclosed where these things to attach - it is not clear. To change WatermarkTextBox, resolutely I do not want. And is easier it can be made? I can somewhere this AdornedElementPlaceholder simply place, and if that - in it exclamation point to light or drop? Manually. If who knows - stick where it is necessary. I did not find.