If you populate the RadChat control using its DataSource and then bind the CurrentAuthor property, the message from the current author don't use the correct color. This reproduces only if the CurrentAuthor binding is set after the DataSource binding.

Note that the title says that this happens when using the DataSource, but you can reproduce it also if simply add a message from an author different than the current one, and then change the CurrentAuthor to the one used for the message.

<telerik:RadChat CurrentAuthor="{Binding MyCurrentAuthor}" DataSource="{Binding MyMessageSource}" />