DevExpress ASPxTextBox properties and themes

I'm using DevExpress in a Web Project and I'm beginner with this tool. So, here is the thing: I've put a simple ASPXTextBox in an "empty" aspx file to make some tests, but there's a blue mark on the field that should not be there, like the following picture:

And here is the code:

<dx:ASPxTextBox ID="ASPxTextBox1" runat="server" Theme="Metropolis" Width="170px"> </dx:ASPxTextBox>

I'm not using any CSS to change the style, it's just the aspx file and nothing else. Any idea of why this blue mark appears? Thank you. Views:0 Time:2018-11-16

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