I attached a sample control library with a text box that has an ErrorState
property. The text box (CustomTextBox) can be themed with Visual Style Builder - just use "Load Control" -> "From Assembly" menu and select the control library's assembly.
In the sample, the default theme is in CustomTextBoxDefault.xml. In that theme, when ErrorState
the background color becomes red.
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.