Why does my control extending RichTextBox defaults to gray background?

Question

I'm attempting to extend a RichTextBox, so as to add some extra functionality; however, I'm running into a strange issue with the background color of my extended RTB. Here is the code:

RichTextBoxExtended.cs

public class RichTextBoxExtended: RichTextBox
{
    // completely empty
}

MyView.xaml

<UserControl x:Class="MyNamespace.MyView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Grid>
        <RichTextBoxExtended />
    </Grid>
</UserControl>

However, when showing this in a WPF page, the background color of the text box is gray, as if it were disabled (which it isn't, since I can still type into it fine). As a test, I replaced <RichTextBoxExtended /> in the XAML with <RichTextBox />, and that control is white as expected.

Does anyone know what could cause this issue? I can easily work around the problem by manually setting the background color to white, but am looking for a better solution.

It's working here....can you show where you are using the UserControl...show the XAML please. — Colin Smith, Sep 06 '12 at 13:13
Try using Snoop - The wpf spy utility to inspect the issue - http://www.snoopwpf.codeplex.com — Harsh Baid, Sep 06 '12 at 13:44

score 1 · Accepted Answer · edited Sep 06 '12 at 13:42

1

I just copy paste your code to a test solution, place a frame in main window and put the RichTextBoxExtended in a page inside the frame, but the background of RTB is completely white. I think there is something else causing the problem.

edited Sep 06 '12 at 13:42

Mike Mackintosh

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answered Sep 06 '12 at 13:12

Bahman_Aries

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Why does my control extending RichTextBox defaults to gray background?

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