Currently, the InputBoxText property of the RadChat control has a read-only purpose. It is updated only when you update the text via the UI. However, the property has also a public setter which implies that it can be set, but this doesn't work. 
Allow setting the InputBoxText property, which should update the text in the input TextBox.

For the moment, you can get the RadWatermarkTextBox element using the FindChildByType<T> method and set its Text property manually.

var textBox = this.chat.FindChildByType<RadWatermarkTextBox>();
textBox.SetCurrentValue(RadWatermarkTextBox.TextProperty, "new text")

Hello!

I wounder how you support the use of emojis in the WPF Chat component. Or is it supported?

Best regards

Hans

Hello,

It would be great to be able to tag an author with @.

The idea is to provide an authors list like in skype :

The authors list could be setted with binding from ViewModel by example. Message could have a tagged authors list too in order to easily send a notification to all tagged users from ViewModel.

Regards,