The TextBox focus state is the text-editing mode by convention and that is why when you set focus on the control or start typing the watermark content is gone. Of course, if you want to edit its states you can open your project with Microsoft Expression Blend and edit the control template from there by following these steps:
- select the RadWaterMarkTextBox and right-click on it
- select 'Edit Template' and then choose 'Edit a Copy'
Now you can see and edit all control visual states.
you can find more details on RadWaterMarkTextBox.
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