i need to remove red rectangle around combobox. I have setup combobox in xaml like (below) this and i`m trying to override of the Validation.ErrorTemplate.
Use this to modify the Validation.ErrorTemplate
And then use it in your ComboBox like
To have no indication of a Validation Error, remove the DockPanel, set Visibility to Collapsed or any other way you like.
Almost forgot, probably the easiest way to remove the "Red Border"