[flexcoders] mx component restrict question

[markflex2007]

Hi,

for mx component. if textinput allow number. I can do this

<mx:TextInput id="textInput"
                restrict="0-9"
                widthInChars="20"
                maxChars="20" />
                
 but I also want to allow negative sign
 
 if I did this
 
 <mx:TextInput id="textInput"
                 restrict="-0-9"
                 widthInChars="20"
                 maxChars="20" />
                 
 I also can type ",."etc
 
 How to do that if I only allow negative sign and number for mx component.
 
 Thanks
 
 
 Mark