Thank your for your interest in RadRichTextBox.
We are aware of the issue you are experiencing and we can confirm it is a bug in RadRichTextBox. We have already logged this in our internal bug-tracking system. However, I cannot commit to a specific time-frame when a fix will be available.
For now, you could subscribe to the related Pressing Tab when caret is at the beginning of a paragraph should change first line indent instead of left indent
item in our feedback portal in order to be notified about any related changes.
As a workaround, you could use the one which is shown in the above-mentioned feedback item. However, if you do not desire to change the indentation and just to insert a tab, you could use the following code snippet instead of the one from the item:
.radRichTextBox.PreviewEditorKeyDown += (
sender, PreviewEditorKeyEventArgs e) =>
(e.Key != System.Windows.Input.Key.Tab)
Sorry for the caused inconvenience.
I hope this helps.
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