MaskedEditExtender

Hi,

Im using the MaskedEditExtender for Date format. My Date Format is Only Month and Year

<abd:MaskedEditExtender ID="creg" runat="server" TargetControlID="tderbox"
InputDirection="LeftToRight" MaskType="Date" Mask="99/9999" >

It display correctly. But when i click outside the textbox the value clears. I also set the ClearTextOnInvalid="false". But still clear values on blur.

Pls suggest some idea. Thanks