CheckBox and RadioBox have not the states "checked"

Today I update the myGUI from svn.
When I test the demo Demo_Themes.exe,I find the CheckBox and RadioBox have not the states "checked".
But I find the describing of CheckBox has 8 states in the corn_skin.xml
It seems the demo only have 4 states that all have not "checked".
I want to know that whether is this a bug or not.

it is not bag.

If it is not a bug,how can I come true CheckBox that has 8 states.
my code as follows:
core_skin.xml

<Resource type="ResourceSkin" name = "CheckBox" size = "100 21" texture = "#{MyGUI_Theme_Texture}">
<Property key="FontName" value = "Default" />
<Property key="TextAlign" value = "Left VCenter" />
<Property key="TextColour" value = "#{MyGUI_Theme_Button_ColourNormal}"/>

<BasisSkin type="SubSkin" offset = "0 0 21 21" align = "Left VCenter">
<State name="disabled" offset = "2 2 21 21"/>
<State name="normal" offset = "2 24 21 21"/>
<State name="highlighted" offset = "2 46 21 21"/>
<State name="pushed" offset = "2 68 21 21"/>
<State name="disabled_checked" offset = "2 90 21 21"/>
<State name="normal_checked" offset = "2 112 21 21"/>
<State name="highlighted_checked" offset = "2 134 21 21"/>
<State name="pushed_checked" offset = "2 156 21 21"/>
</BasisSkin>

<BasisSkin type="SimpleText" offset = "24 0 76 21" align = "Stretch">
</BasisSkin>
</Resource>

test.layout

<Widget type="Button" skin="CheckBox" position="176 48 72 16" layer="Back"/>

Whether should I add some code in test.layout for "checked".
Or I must add some code in my app.

ChackBox is actually skin for Button, so by default it have button behaviour. Check FAQ(question about CheckBox) to see how make it stay checked after click.

Thank you.I solve the problem.