Accessible read only checkbox in Silverlight

How can I have an accessible read only checkbox in Silverlight? The accessibi开发者_StackOverflowlity requirements are so that a screen reader can read the data as the user tabs through the control. Here’s what I have tried so far:

• IsEnabled=True is no good because the control can not gain focus which is needed for the screen reader
• IsHitTestVisible=False is no good because you can still change the value by pressing the space bar when it has focus
• IsTabStop=False is no good because you can still change the value by clicking the tickbox
• For other controls such as the TextBox, I have used the IsReadOnly property, but this doesn’t seem to be available on the CheckBox.

Couldn't you always revert the Checked value when it changes? You could even restyle the control so that the Normal state looked like the not enabled state.