For ComboBox the TextBoxHelper.Watermark only works when IsEditable

[dsaf]

Also when I set IsEditable to True then it will select the text on selecting item. So it is not ideal.

[punker76]

that's fixed in upcoming v1.2.0 (alpha version)
-> Watermark on ComboBox where IsEditable="False" #1958 #1953

[dsaf]

Understood, thank you.