现在，主体画布将有一个新的自定义背景颜色。
The body canvas will now have the new custom background color.
您可以看到所应用的表单的背景颜色和文本字段的字体样式，与我们在自定义主题中所定义的内容相同。
You can see that the background color of the form and the font style of the text fields are applied as we defined them in the custom theme.
在上述的情况下，每个需要自定义背景控件的对话框都不得不处理控件颜色通知消息。
In the case above, every dialog box that wanted controls with custom backgrounds would have to handle the control color notification message.
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