Kv language doesn't see the file in the directory
<p>I have textures for my buttons grouped in a folder <code>textures\button</code> (relative to the code file). Throughout my code, I have specified this path in several places, in the kv and in Python code. The Python code seemed to recognize the textures just fine, while the kv failed to find them. What's up with that?<br>
Here is the code sample:</p>

<pre><code>from kivy.app import App
from kivy.uix.button import Button
from kivy.lang import Builder

Builder.load_string('''
&lt;MyButton&gt;:
    background_normal: "textures\\button\\normal.png"
''')

class MyButton(Button):
    pass

class TestApp(App):
    def build(self):
        bt = MyButton()
        return bt

TestApp().run()
</code></pre>

<p>This gave me a blank texture. However, when I removed the kv part and built my button like that: </p>

<pre><code>bt = MyButton(background_normal = "textures\\button\\normal.png")
</code></pre>

<p>the texture appeared.<br>
I'm using Kivy <code>v1.9.2-dev0</code></p>