using IsPressed ... problem

In Beta1 I had buttons which had clickmode set to "Pressed" ... then checked whether a button was continuing in the pressed state by checking during MouseMove.  

Button Sender = (Button)sender;

if(Sender.IsPressed){//do somethign}  ... if the user had mousedown while moving the IF evaluated true

 However in Beta2 that methodology isn't working...  during mousemove the same button always returns Sender.IsPressed == false regardless of whether the user has left button pressed while moving... I can't figure out why.

 This is key to the program I'm developing, can anyone give me some guidance?

tom
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